Plain-English glossary of pet supply terms

Nutrition

AAFCO statement

A line on a US pet food label declaring whether the recipe is nutritionally complete for a specific life stage, and how that was demonstrated.

Nutrition

Amino acid profile

The mix of individual amino acids — including the ten essential ones dogs and eleven cats can't synthesize — supplied by a diet's protein sources. Total crude protein on the label doesn't tell you whether the profile is complete.

Health

Anal gland expression

Manual emptying of the paired anal sacs, small scent glands flanking the anus, performed when the natural emptying mechanism (firm stool pressure during defecation) is not keeping them clear.

Nutrition

Ash content

The mineral residue left when a pet food sample is incinerated, a proxy for total mineral content, dominated by calcium, phosphorus, magnesium, sodium, and potassium.

Health

Aural (ear) hematoma

A pocket of blood that forms between the skin and cartilage of the ear flap, usually after violent head-shaking or scratching. The ear looks like a swollen water balloon and needs veterinary drainage — it will not resolve on its own without deforming.

Gear

Automatic feeder

A timer- or app-controlled device that dispenses pre-measured portions of dry food at scheduled intervals. Distinct from gravity feeders, which simply refill a bowl on demand.

Nutrition

BARF diet

Biologically Appropriate Raw Food (or Bones And Raw Food), a feeding philosophy that combines raw muscle meat, raw meaty bones, organ, vegetables, and supplements in ratios meant to approximate a prey-model diet.

Behavior

BAT (Behavior Adjustment Training)

A reactivity protocol developed by Grisha Stewart in which the dog is given enough leash and space to make their own choices around a trigger, with the handler supporting movement away rather than commanding it. Current version: BAT 2.0.

Nutrition

BHA / BHT preservatives

Butylated hydroxyanisole and butylated hydroxytoluene, synthetic antioxidants used in some pet foods to keep fats from going rancid. Both are FDA-approved for that purpose; both are controversial in pet-owner circles.

Gear

Biothane leash

A leash made of polyester webbing coated in TPU or PVC. Waterproof, odorless, easy to wipe clean, and standard for long-lines used in recall training and decompression walks.

Health

Bloat (GDV)

Gastric dilatation and volvulus, the stomach fills with gas (dilatation) and then twists on itself (volvulus), cutting off blood supply. A life-threatening emergency requiring surgery within hours.

Health

Body Condition Score (BCS)

A standardized 9-point scale used by veterinarians to assess whether a dog or cat is underweight, ideal, or overweight. The WSAVA BCS charts are the global reference.

Health

Brachycephalic

Short- and flat-headed conformation, Bulldogs, Pugs, French Bulldogs, Boston Terriers, Persians, Himalayans. The skull shape is associated with chronic airway problems collectively called brachycephalic airway syndrome.

Gear

Breakaway collar

A collar with a safety buckle that releases under sustained pulling force. Standard of care for cats and increasingly popular for dogs kept indoors, on tie-outs, or around fencing where a snag could cause strangulation.

Nutrition

By-product meal

A dry, rendered, concentrated protein ingredient made from clean parts of slaughtered animals other than the lean muscle meat, organs, bone, and connective tissue, ground and cooked.

Behavior

Calming signals

A vocabulary of subtle body-language behaviors — lip licks, head turns, yawns, ground sniffing, slow blinks — that dogs use to signal 'I'm not a threat, please de-escalate.' Popularized by Norwegian trainer Turid Rugaas and now standard in most force-free training curricula.

Nutrition

Caloric density (kcal/cup)

The number of kilocalories per cup (or per gram) of a specific pet food. Two foods that look identical in the bowl can differ by 100+ kcal/cup, which is the difference between a healthy weight and slow creeping obesity.

Behavior

Capturing (training)

Marking and rewarding a behavior the dog already offers spontaneously, in order to bring it under cue. The trainer waits for the behavior, captures it with a click (or marker), pays, and over many repetitions adds a name.

Gear

Cat tree

A multi-level vertical structure with platforms, hiding spots, and scratching surfaces. Provides one of the five environmental "pillars" identified by the AAFP/ISFM Feline Environmental Needs Guidelines, vertical territory.

Health

Cataracts

Opacity of the eye's lens that blocks light from reaching the retina. Ranges from tiny incipient spots that don't affect vision to full mature cataracts that cause blindness. Diabetes is the single largest risk factor in dogs.

Health

Cherry eye

Prolapse of the gland of the third eyelid (nictitans gland), visible as a red, cherry-like mass in the inner corner of the eye. Most common in young dogs of predisposed breeds — Bulldogs, French Bulldogs, Beagles, Cocker Spaniels — and occasionally in Burmese and Persian cats.

Health

Chronic kidney disease (CKD)

Progressive, irreversible loss of nephron function over months to years, leading to impaired waste filtration, fluid balance, and erythropoietin production. The most common cause of death in geriatric cats.

Behavior

Clicker training

A reinforcement-based training method that uses a brief, distinct sound (a clicker, or a consistent verbal marker) to tell the animal the exact instant they earned a reward. The click is the bridge; the food is the payment.

Gear

Cooling vest

A wearable vest — either soaked-and-wrung evaporative fabric, phase-change gel packs, or ice-pack pockets — designed to lower a dog's surface temperature during warm-weather activity. Most useful for double-coated, brachycephalic, and dark-coated dogs.

Health

Core vs non-core vaccines

The veterinary classification of vaccines into 'core' (recommended for every animal of the species regardless of lifestyle) and 'non-core' (recommended only when risk assessment justifies them).

Behavior

Counter-conditioning

Changing an animal's emotional response to a trigger by pairing the trigger with something the animal likes. Almost always run alongside desensitization (D&CC), exposure stays below threshold while the new association forms.

Gear

Crate training

The process of teaching a dog to enter, settle, and rest in a closed crate willingly. Useful for housetraining, travel, post-surgery recovery, and giving the dog a defensible quiet space.

Nutrition

Crude protein

A guaranteed-analysis figure on US pet food labels representing the percentage of protein in the product, calculated from total nitrogen content rather than measured directly.

Health

DCM (dilated cardiomyopathy)

A disease in which the heart muscle weakens and the heart chambers enlarge, reducing the heart's ability to pump blood. Recognized in several dog breeds and, less often, in cats.

Gear

Dental chew (VOHC-accepted)

An edible or long-lasting chew designed to mechanically reduce plaque and tartar. Products carrying the Veterinary Oral Health Council (VOHC) seal have submitted clinical evidence that they meaningfully reduce plaque, calculus, or both.

Behavior

Desensitization

Gradual exposure to a fear-inducing stimulus at an intensity low enough that the animal does not react, with intensity slowly increased over many sessions. Almost always paired with counter-conditioning (D&CC) in modern behavior protocols.

Health

Diabetes mellitus

A chronic endocrine disease in which insufficient insulin production or insulin resistance prevents glucose from entering cells, resulting in hyperglycemia, glucosuria, and a cluster of clinical signs, polyuria, polydipsia, polyphagia, and weight loss.

Nutrition

Dietary fiber

The carbohydrate fraction of pet food that resists digestion in the small intestine and either passes through (insoluble) or ferments in the colon (soluble), supporting gut motility, microbiome, and stool quality.

Gear

E-collar (shock collar)

A remote- or sensor-triggered collar that delivers an electric stimulus ("static," "stim," or shock) to the dog's neck. Also marketed as "e-collar," "remote trainer," or "stim collar", the mechanism is the same.

Gear

Elevated feeder

A stand that raises the food and water bowls off the floor to shoulder or chest height. Marketed for large-breed dogs and senior pets, but the evidence for who actually benefits is narrower than the marketing suggests.

Behavior

Enrichment

Structured opportunities for an animal to use its species-typical behaviors, sniffing, foraging, chewing, problem-solving, climbing, to meet welfare needs that go beyond food, shelter, and walks.

Behavior

Fear period

A developmental phase during which a normally confident puppy or adolescent dog suddenly becomes wary of new (or even familiar) things. Two are commonly observed: roughly 8–11 weeks, and a longer adolescent fear period in the 6–14 month range.

Health

Flea life cycle

The four-stage development of Ctenocephalides felis, the cat flea, also the dominant flea on dogs, from egg to larva to pupa to adult, with 95% of the population existing off the host at any given time.

Health

FLUTD (feline lower urinary tract disease)

An umbrella term for a cluster of conditions affecting the bladder and urethra in cats, including idiopathic cystitis, bladder stones, urinary tract infection, and urethral obstruction. Some forms are immediately life-threatening.

Nutrition

Freeze-dried raw

A pet food in which raw meat, organ, and bone are frozen, then placed under vacuum so the ice sublimates directly to vapor, producing a shelf-stable product that rehydrates close to the original raw state.

Gear

Front-clip harness

A no-pull harness with the leash attachment on the chest, in front of the dog's shoulders. Pulling pivots the dog sideways, reducing forward leverage.

Health

Giardia

A single-celled intestinal parasite (Giardia duodenalis) that dogs and cats pick up from contaminated water, soil, or feces. Causes soft, mucusy, sometimes greasy diarrhea. Zoonotic potential is low but not zero.

Nutrition

Glucosamine

An amino sugar that is a precursor for glycosaminoglycans in cartilage and synovial fluid, sold as an oral joint supplement, usually paired with chondroitin sulfate, for dogs and cats with osteoarthritis.

Gear

GPS tracker

A collar-mounted device that reports the pet's live location via satellite GPS plus a cellular or LTE-M data link. Distinct from Bluetooth tags, which only locate within ~30 m of a phone.

Nutrition

Grain-free diet

A pet food recipe that excludes wheat, corn, rice, barley, oats, and other cereal grains, usually replacing them with legumes, potatoes, or tubers.

Nutrition

Guaranteed analysis

The mandatory panel on a US pet food label that lists minimum or maximum percentages for crude protein, crude fat, crude fiber, and moisture, the legal nutrient floor and ceiling of the product.

Gear

Head halter

A nose-loop and neck-strap walking tool (e.g. Gentle Leader, Halti) that steers the dog by the head. Like a horse halter: where the head goes, the body follows.

Health

Heartworm

Dirofilaria immitis, a parasitic nematode transmitted by mosquitoes that matures into adult worms living in the pulmonary arteries and right heart of dogs (and, less commonly, cats), causing pulmonary disease, right-sided heart failure, and death if untreated.

Gear

Heated bed

A pet bed with a low-wattage heating element designed to warm to roughly the pet's body temperature. Used for arthritic pets, thin-coated breeds, and seniors who lose thermal regulation.

Health

Hip dysplasia

An inherited malformation of the hip joint where the ball and socket don't fit together properly, leading to instability, abnormal wear, and eventually arthritis. Most common in large-breed dogs.

Nutrition

Hydrolyzed protein

A dietary protein that has been enzymatically broken into very small peptide fragments, typically under 10 kilodaltons, too small for the immune system to recognize as an allergen.

Health

Hyperthyroidism (feline)

Excess thyroid hormone production, almost always from benign functional adenoma, in middle-aged and older cats, causing weight loss despite increased appetite, hyperactivity, tachycardia, vomiting, and polyuria/polydipsia.

Gear

IATA-compliant carrier

A pet travel crate built to meet the International Air Transport Association's Live Animals Regulations, the rulebook every commercial airline references for animals in cabin or cargo.

Nutrition

Kibble extrusion

The high-temperature, high-pressure cooking process that turns a wet dough of meat, grain, and additives into the dry, shelf-stable pellets that dominate the pet food market.

Behavior

Learned helplessness

A psychological state in which an animal stops attempting to escape or change an aversive situation after repeated experiences of having no control. First described by Seligman and Maier's dog experiments in 1967; revisited in 2016, they concluded the original interpretation was backward, and that passivity is the default, with control being what is learned.

Behavior

Leash reactivity

Big, loud responses, barking, lunging, growling, directed at a specific trigger (usually other dogs, sometimes people, bikes, or cars) while on leash. Distinct from off-leash behavior, which is often calm.

Gear

Lick mat

A silicone mat with textured ridges that hold soft food (wet food, yogurt, peanut butter, pumpkin) so the dog has to lick it out over time. Used for calming, distraction, and slow-feeding wet food.

Nutrition

Life-stage formula

A pet food whose nutrient profile is formulated to meet AAFCO's requirements for a specific stage of life, growth, gestation/lactation, adult maintenance, or all life stages.

Behavior

LIMA (Least Intrusive, Minimally Aversive)

A professional standard adopted by major training and behavior organizations (CCPDT, IAABC, APDT). LIMA requires consultants to use the least intrusive, minimally aversive intervention that has a reasonable chance of working, and to be educated enough to know what that is.

Nutrition

Limited-ingredient diet (LID)

A commercial diet formulated with the shortest reasonable ingredient list — usually one protein source and one carbohydrate source — to simplify elimination trials for suspected food allergies or intolerances. Not the same as a hypoallergenic diet.

Behavior

Litter box aversion

A learned avoidance of the litter box itself — usually triggered by pain (UTI, arthritis, constipation), the substrate, the box, the location, or a bad experience there. Presents as urination or defecation outside the box despite the box being available.

Gear

Litter box sizing (1.5× rule)

The general veterinary rule is that a litter box should be at least 1.5× the length of the cat from nose to base of tail, with one box per cat plus one extra, placed in separate locations. Undersized or under-provisioned boxes are the single most common trigger of house-soiling behavior.

Behavior

Luring

Using a piece of food (or a toy) as a magnet to physically guide the dog into a position, treat at the nose moves up, the dog's head follows up, the rear drops into a sit. Fast for the basics, but the lure must be faded or it becomes a permanent crutch.

Gear

Martingale collar

A two-loop collar that gently tightens when a dog pulls but is limited so it can't choke. Designed for dogs whose heads are narrower than their necks and can slip flat collars.

Nutrition

Meat meal

A dry, rendered protein ingredient made by cooking meat and skeletal muscle (with or without bone) until the water and most of the fat are removed, leaving a concentrated 60–70% protein powder.

Health

Microchip

A small RFID transponder, typically 11–14 mm long, implanted subcutaneously, encoded with a unique identifier that, when scanned, links to an owner record in a registry database. The most reliable form of permanent pet identification.

Gear

No-pull harness

Umbrella term for harnesses designed to reduce pulling, usually via a front chest clip, sometimes both front and back rings. "No-pull" describes the mechanical intent, not a specific design.

Nutrition

Novel protein

A protein source the individual animal has never eaten before, used to diagnose or manage cutaneous adverse food reactions by removing previously sensitizing antigens from the diet.

Nutrition

Omega-3 (EPA/DHA)

Long-chain omega-3 fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), primarily from marine sources, with documented anti-inflammatory and developmental effects in dogs and cats.

Health

Osteoarthritis (OA)

Progressive, non-inflammatory degenerative joint disease characterized by cartilage loss, subchondral bone remodeling, and osteophyte formation. The most common chronic pain condition in adult dogs and cats.

Health

Parvovirus (canine CPV-2)

A highly contagious, environmentally stable DNA virus that infects rapidly dividing cells of the small intestinal crypts and bone marrow in dogs, primarily unvaccinated puppies, causing severe hemorrhagic enteritis and, untreated, death.

Health

Periodontal disease

Inflammation and progressive destruction of the tissues supporting the teeth, gingiva, periodontal ligament, alveolar bone, driven by bacterial plaque biofilm. The most common diagnosed disease of adult dogs and cats.

Health

Pet insurance

A reimbursement-model insurance product that covers a defined percentage of eligible veterinary costs, typically accidents and illness, sometimes wellness, after deductibles, exclusions, and waiting periods.

Behavior

Place training

Teaching a dog to go to a defined mat, bed, or cot and stay there until released. One of the highest-leverage behaviors in a family dog's training repertoire — it replaces underfoot begging, doorway rushing, and reactive window-barking with a calm, portable off-switch.

Behavior

Positive reinforcement

Adding something the animal wants (food, play, access) immediately after a behavior, in order to make that behavior more likely. One of the four quadrants of operant conditioning, and the foundation of every major modern training standard.

Behavior

Predatory drift

The moment a normal play or social interaction slides into predatory behavior in a dog. Most commonly seen when a larger dog is playing with a small dog and the small dog yelps, runs, or trips — the size differential plus prey-like motion trips the predatory sequence.

Behavior

Premack principle

A high-probability behavior can be used to reinforce a low-probability behavior. Practically: do this less-fun thing, and you get to do this more-fun thing. Named for psychologist David Premack.

Nutrition

Prescription diet

A therapeutic pet food formulated to manage a diagnosed medical condition, sold under veterinary authorization rather than as a general retail product. Often called a 'veterinary therapeutic diet'.

Behavior

Prey drive

The instinctive predatory motor sequence, orient → eye → stalk → chase → grab-bite → kill-bite → dissect → consume. Different breeds were bred to express different parts of the sequence; few modern pet dogs have the full chain.

Nutrition

Probiotics

Live microorganisms, typically Lactobacillus, Bifidobacterium, and Enterococcus species, or the spore-forming Bacillus and yeast Saccharomyces boulardii, administered to confer a health benefit on the host.

Gear

Prong collar

A metal training collar with inward-facing blunt prongs that apply pinching pressure around the neck when the leash is tightened. Highly controversial; legal status varies by country.

Gear

Puzzle feeder

Any food-dispensing toy that requires the dog or cat to solve a small mechanical problem to extract kibble or treats. Includes treat balls, sliding-tile puzzles, stuffable rubber toys, and rolling dispensers.

Health

Pyometra

A life-threatening bacterial infection of the uterus in intact female dogs and cats, typically developing in the weeks following estrus when progesterone-induced cervical closure traps bacteria inside a hormonally-primed uterus.

Behavior

Redirected aggression

Aggression aimed at a nearby target — a housemate, another pet, or a person — after the animal is aroused by something it can't reach (a cat outside the window, a squirrel, a dog on the other side of the fence). Extremely common in cats; also seen in leash-reactive dogs.

Behavior

Resource guarding

A dog (or cat) defending something it values, food, toys, beds, sometimes a person, with body language, growling, snapping, or biting. A normal behavior in animals; a manageable behavior with training.

Gear

Retractable leash

A leash with a spring-loaded reel inside a plastic handle, typically extending 15–26 feet. Provides variable distance but with significant failure modes the leash industry quietly acknowledges.

Health

Reverse sneezing

A sudden, repetitive inhalation through the nose that sounds like a dog is choking or gasping. Officially called paroxysmal respiration or pharyngeal gag reflex. Usually harmless and self-limiting, but frightening the first time you see it.

Gear

Scratching post

A vertical (or horizontal) substrate cats can dig their claws into. Scratching is a hardwired feline behavior for claw maintenance, stretching, and scent/visual marking, not a behavior problem to solve, a need to accommodate.

Behavior

Separation anxiety

A panic-level distress response triggered by being left alone (or away from a specific person). Distinct from boredom-driven destruction: separation anxiety is a clinical anxiety disorder, not a discipline problem.

Behavior

Shaping (training)

Building a complex behavior by reinforcing successive approximations, small steps that progressively look more like the final behavior. The dog earns rewards for getting incrementally closer, with the trainer raising criteria as the dog succeeds.

Gear

Slow feeder

A bowl with raised ridges, channels, or maze patterns that force a dog or cat to eat around obstacles, slowing meal speed by several minutes. Used for digestion, weight management, and mild enrichment.

Gear

Snuffle mat

A rubber-backed mat with thick fleece strips tied through it. Kibble or treats are scattered into the fleece; the dog uses their nose to forage them out.

Behavior

Socialization window

The developmental period, roughly 3 to 12–14 weeks in puppies, during which positive exposures to people, animals, surfaces, sounds, and environments shape lifelong sociability and resilience. After this window closes, new things default to scary rather than neutral.

Health

Spay / neuter

Surgical sterilization, ovariohysterectomy or ovariectomy in females (spay), orchiectomy in males (neuter), eliminating reproductive capacity and altering sex-hormone-driven behavior and disease risk.

Nutrition

Taurine

An amino acid that cats cannot make in sufficient quantity and must get from food. Deficiency causes blindness and a specific, often fatal form of heart disease.

Health

Titer test

A blood test that measures circulating antibody concentration against a specific pathogen, used in vaccine decisions to determine whether an animal retains protective immunity from a previous vaccination.

Behavior

Trigger stacking

The cumulative effect of multiple stressful events in a short window. An animal that would tolerate any one trigger can react severely to a third or fourth, even if the third one is minor.

Gear

Water fountain

An electric pump-and-filter unit that keeps drinking water moving and filtered. Many cats and some dogs drink more from moving water than from a static bowl.

Nutrition

Wet vs dry food moisture

Canned food is typically 75–82% water; kibble is typically 6–10% water. This single difference drives most of the practical arguments between the two formats, especially for cats.

Health

Xylitol toxicity

Xylitol is a sugar alcohol used as a sweetener in gum, mints, peanut butter, baked goods, and some medications. In dogs it triggers a rapid insulin release, causing life-threatening hypoglycemia and, at higher doses, acute liver failure.