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The Gray Muzzle Ledger / Senior pet glossary: plain-language terms vets use

Senior pet glossary: plain-language terms vets use

Quick answerOlder-pet care comes with its own vocabulary. This glossary explains the words vets and guidelines use, in everyday language, and points to the guide on this site that covers each one. It is general information, not a diagnosis.

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Published Oct 20, 2026 · Updated Oct 20, 2026 · By the Editorial team. General education, not veterinary advice and not yet individually reviewed by a licensed veterinarian. About and sources

Age and life stages

Senior

In the AAHA life stage guidelines, a senior dog is one in roughly the last 25% of its estimated lifespan, and a senior cat is one older than 10 years. Large and giant breeds reach that stage earlier than small ones. When is a dog or cat considered senior?

Life stage

A way of grouping pets by where they are in life (puppy or kitten, young adult, mature adult, senior) so that care such as vaccines, diet and checkup frequency can be matched to the stage, not to a single age number. How life stages work

Dog years

The popular idea that one dog year equals seven human years is not accurate. A study from UC San Diego and UC Davis based on DNA changes in Labrador Retrievers proposed human age ≈ 16 × ln(dog age) + 31, which is a research estimate and not a rule for every breed. Dog years calculator

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Pain, mobility and the brain

Arthritis (osteoarthritis)

Long-term wear and inflammation in the joints. In older dogs and cats it often shows up as stiffness, slowness to rise, or reluctance to jump, climb stairs or use a litter box with a high side. Cats are good at hiding it. Signs of pain and arthritis

Lameness

A limp or uneven way of walking. It can be constant or come and go, and it can come from a joint, a paw, a muscle or the spine. A vet works out which.

Cognitive dysfunction syndrome (CDS)

Age-related changes in a pet's brain that can show up as disorientation, night-time pacing or restlessness, changes in sleep, or forgetting routines. Cornell's veterinary college describes it in senior dogs. Other conditions can look the same, so a vet visit comes first. Confusion and night pacing

Gait

The way an animal walks. Vets watch gait for changes such as dragging a paw, a short stride or swaying. A short phone video of your pet walking can help them see what you see at home.

Tests and visits

Senior workup

The set of exams and tests a vet suggests for an older pet. AAHA's senior care guidelines recommend a medical workup once or twice a year, with the exact plan set by your vet. How often to see the vet

Complete blood count (CBC)

A blood test that counts red cells, white cells and platelets. It can show signs of anemia, infection or inflammation.

Chemistry panel

A blood test that measures substances linked to organs such as the kidneys and liver, plus blood sugar and electrolytes. AAHA lists it among senior bloodwork.

Urinalysis

A test of a urine sample. Along with bloodwork it helps vets look at kidney function, hydration and urinary problems.

Body condition score (BCS)

A hands-on score of how lean or heavy a pet is, usually on a 1 to 9 scale where the middle is ideal. Weight alone can hide muscle loss in older pets, so vets use both. Body condition score for older dogs

Polydipsia and polyuria

Medical words for drinking more than usual (polydipsia) and urinating more than usual (polyuria). Either one is worth noting down and reporting to your vet. Appetite, weight and thirst

Tracking tools

Quality-of-life scale

A checklist that turns how your pet is doing into scores you can compare over time and talk through with your vet. It informs a decision but does not make it. Tracking quality of life

HHHHHMM scale

A quality-of-life scale created by veterinarian Dr. Alice Villalobos. The letters stand for Hurt, Hunger, Hydration, Hygiene, Happiness, Mobility and More good days than bad. Each is scored from 0 to 10. Good days self-check

Symptom log

Dated notes on what you see: appetite, water, weight, mobility, mood, medications. Small slow changes are easy to miss without one. Printable daily log

Sources

Definitions are plain-language summaries for general education. They do not diagnose anything.

More from The Gray Muzzle Ledger

Good days: a quality of life self-check for older petsA gentle seven-category scale (HHHHHMM, by Dr. Alice Villalobos) to notice changes and bring notes to your vet.Dog years calculator: dog age in human yearsConvert your dog’s age to human years with the UC Davis formula, 16 × ln(dog age) + 31. Why the old ×7 rule is wrong.When is a dog or cat considered senior?What “senior” means in the AAHA guidelines: the last 25% of a dog’s expected lifespan, and over 10 years for cats.How often should a senior pet see the vet?AAHA recommends a senior workup once or twice a year, with lab work every 6 to 12 months. What to ask and bring.