Paw Primer

Dog & Cat Dog

Smaller pets run faster resting hearts and shorter lives, and the same rule sorts dog breeds, with small dogs outliving giant ones.

Resting heart rate, typical lifespan and adult body mass for 19 animals, from toy dogs to the blue whale, drawn from Merck, Cornell, AKC and AnAge.

Della Ruiz ·

Resting heart rate tracks body size closely: the smaller the animal, the faster its heart and, as a rule, the shorter its life. A resting cat runs about 140 to 220 beats a minute against a large dog’s 60 to 100, and a Syrian hamster clears 300. That pattern holds inside the dog too, where a toy breed’s heart beats quicker than a giant breed’s and the small dog tends to live several years longer. The table and chart below pair resting heart rate with typical lifespan and body mass for five dog size classes, the house cat, eight common small pets, and five wild mammals for scale.

Sort any column, filter by category, or hover a dot on the chart to read that animal’s full line.

Small animals run fast hearts and short lives; big ones run slow hearts and long ones. A resting hamster heart beats past 300 times a minute and the animal is old at three; a blue whale’s can drop to a handful of beats on a dive, and it may live a century. Dogs carry that same rule inside one species — a toy breed’s heart runs quicker than a giant breed’s, and the small dog usually lives several years longer. Every figure below is a resting-animal range from a veterinary or physiology source, with ranges kept where the source gave a range.

Resting Heart Rate, Lifespan & Body Mass — 19 Animals

Click a column header to sort; hover a header for what it means. Filter by category, or hover a chart dot for that animal’s full line.

Resting Heart Rate Vs Body MassSmaller Animals Run Faster Hearts — Log–Log Scale10 g100 g1 kg10 kg100 kg1 t10 t100 t102050100200400600Typical Body Mass (Log Scale)Resting Heart Rate — Bpm (Log Scale)Allometric Trend (241·kg−0.25)Toy Dog — ~90–140 bpm · 12–16 yr · 1.4–5.5 kg (3–12 lb)Small Dog — ~90–140 bpm · 12–15 yr · 5.5–11 kg (12–25 lb)Medium Dog — 70–120 bpm · 10–13 yr · 11–23 kg (25–50 lb)Large Dog — 60–100 bpm · 10–12 yr · 23–45 kg (50–100 lb)Giant Dog — ~60–100 bpm · 8–10 yr · over 45 kg (100+ lb)Cat — 140–220 bpm · 12–18 yr · 3.6–5.4 kg (8–12 lb)Rabbit — 180–350 bpm · 8–12 yr · 0.9–5 kg (2–11 lb)Ferret — 200–250 bpm · 6–10 yr · 1.2–2 kg (2.5–4 lb)Guinea Pig — 200–350 bpm · 5–8 yr · 700–1,200 gChinchilla — ~200–350 bpm · 10–20 yr · 400–600 gHedgehog — 180–280 bpm · 4–6 yr · 300–600 gRat — 250–400 bpm · 2–3 yr · 350–650 gGerbil — 260–600 bpm · 2–3 yr · 70–130 gHamster — 300–600 bpm · 2–3 yr · 110–140 gMouse — ~500–600 bpm · up to 4 yr · ~20 gHuman — 60–100 bpm · ~80 yr (max 122) · ~62 kgHorse — 28–44 bpm · ~25–30 yr (max 57) · 300–500 kgElephant — 25–35 bpm · ~60–65 yr · ~4,800 kgBlue Whale — diving 2–8, surface up to 37 bpm · ~80–90 yr (max 110) · ~136,000 kgToy DogGiant DogCatRabbitFerretGuinea PigRatHamsterMouseHumanHorseElephantBlue Whale
Companion / Small Pet Wild Reference Allometric Trend (heart rate ∝ mass−¼)
19 of 19 rows
AnimalCategoryResting HR (Bpm)Lifespan (Yrs)Typical Body MassSource
Toy DogCompanion Dog~90–14012–161.4–5.5 kg (3–12 lb)Merck; AKC
Small DogCompanion Dog~90–14012–155.5–11 kg (12–25 lb)Merck; AKC
Medium DogCompanion Dog70–12010–1311–23 kg (25–50 lb)Merck; AKC
Large DogCompanion Dog60–10010–1223–45 kg (50–100 lb)Merck; AKC
Giant DogCompanion Dog~60–1008–10over 45 kg (100+ lb)Merck; AKC
Cat (Domestic)Companion Cat140–22012–183.6–5.4 kg (8–12 lb)Merck; Cornell
RabbitSmall Pet180–3508–120.9–5 kg (2–11 lb)Merck; VCA
FerretSmall Pet200–2506–101.2–2 kg (2.5–4 lb)Merck
Guinea PigSmall Pet200–3505–8700–1,200 gMerck
ChinchillaSmall Pet~200–35010–20400–600 gLafeberVet; VCA
Hedgehog (African Pygmy)Small Pet180–2804–6 (to 8)300–600 gMerck
RatSmall Pet250–4002–3350–650 gMSD; VCA
GerbilSmall Pet260–6002–370–130 gMerck; Bristol
Hamster (Syrian)Small Pet300–6002–3110–140 gMerck
House MouseWild Reference~500–600up to 4~20 gAnAge; physiology
Human (Adult)Wild Reference60–100~80 (max 122)~62 kgLevine; AnAge
HorseWild Reference28–4425–30 (max 57)300–500 kgAnAge; The Horse
African ElephantWild Reference25–3560–65~4,800 kgAnAge
Blue WhaleWild Reference2–3780–90 (max 110)~136,000 kgGoldbogen 2019; AnAge
How to read a resting rate: these are calm, resting-animal ranges. A vet-clinic visit, exercise, heat, fear or pain all push the real number higher — Merck notes cats often read 180–220 bpm in a hospital even though a calm cat sits lower. Count your own pet’s rate at home while it rests: feel the heartbeat behind the left elbow, count the beats in 15 seconds and multiply by four. A rate well outside the range for your pet’s size, or one you cannot settle, is worth a call to your vet.

Sources

  1. The Cardiovascular System in AnimalsMerck Veterinary ManualStates the sinoatrial node fires 60–120 times/min in dogs “depending on the animal’s size,” and >120/min in cats (typically 180–220 in a hospital setting). Basis for the dog and cat heart-rate rows.
  2. Resting Heart Rates (species table)Merck Veterinary ManualCross-species resting heart-rate table: rabbit 180–350, hamster 300–600, rat 250–400 bpm.
  3. Vital Signs in Healthy Adult FerretsMerck Veterinary ManualFerret heart rate 200–250 bpm; the ferret is absent from the cross-species table, so this ferret-specific table was used. Ferret lifespan (6–10 yr) and body mass from Merck’s “Ferrets at a Glance.”
  4. Physiological Data for Guinea PigsMerck Veterinary ManualGuinea pig heart rate 200–350 bpm, lifespan 5–8 yr, weight 700–1,200 g (sows lighter than boars).
  5. Physiologic Data for African Pygmy HedgehogsMerck Veterinary ManualHedgehog heart rate 180–280 bpm, lifespan average 4–6 yr (may reach 8), weight 300–600 g.
  6. Hamsters (Exotic and Laboratory Animals)Merck Veterinary ManualSyrian hamster lifespan 2–3 yr and body weight 110–140 g.
  7. Gerbils (Exotic and Laboratory Animals)Merck Veterinary ManualGerbil lifespan 2–3 yr and body weight (females 70–100 g, males 80–130 g). Merck does not publish a gerbil heart rate.
  8. Gerbil Fact File (Handling a Gerbil)University of Bristol Veterinary SchoolSource for the gerbil heart rate (260–600 bpm), which Merck omits.
  9. Description and Physical Characteristics of RatsMSD Veterinary ManualPet rat lifespan (~1.5–3 yr) and body weight (females 350–450 g, males 450–650 g). MSD is the international edition of Merck.
  10. Rabbits as PetsVCA Animal HospitalsRabbit lifespan up to ~12 years with good care.
  11. Chinchillas – OwningVCA Animal HospitalsChinchilla lifespan 15–20 yr and adult weight 400–600 g; Merck gives a lower central lifespan of 10–15 yr.
  12. Basic Information Sheet: ChinchillaLafeberVetChinchilla heart rate ~200–350 bpm — neither Merck nor VCA publishes one, so this figure (marked ~) is the least-corroborated in the table; some references cite a lower 100–150 bpm.
  13. Loving Care for Older CatsCornell Feline Health CenterCats are now considered “older” at 12–14 years; many indoor cats reach 15–20. Basis for the cat lifespan band.
  14. How Long Do Dogs Live?American Kennel ClubLifespan by size: small 10–15 (to 18), medium 10–13, large 10–12, giant 8–10 years.
  15. Why Do Small Dogs Live Longer?American Kennel ClubCites Urfer’s 169,000-dog study: median lifespan small 14.95, medium 13.86, large 13.38 years — body size the strongest predictor. Supports the small-live-longer storyline.
  16. AnAge: The Animal Ageing and Longevity DatabaseHuman Ageing Genomic ResourcesAdult body mass and maximum recorded lifespan for mouse (~20 g, 4 yr), human (~62 kg, 122 yr), horse (57 yr), African elephant (~4,800 kg, 65 yr) and blue whale (~136,000 kg, 110 yr).
  17. Rest Heart Rate and Life Expectancy (Levine HJ, 1997)Journal of the American College of CardiologyThe classic heart-rate–lifespan editorial: a ~35-fold heart-rate span from hamster to whale, averaging ~7.3×10⁸ lifetime heartbeats; humans (70 bpm) are the outlier that lives far longer than the rate predicts.
  18. Extreme Bradycardia and Tachycardia in the World’s Largest Animal (Goldbogen et al., 2019)PNASFirst heart rate measured on a diving blue whale: as low as 2 bpm on deep dives, up to ~37 bpm at the surface (n=1, Monterey Bay).
  19. Normal Vital SignsThe HorseAdult horse resting heart rate 28–44 bpm.

Method

Each figure was pulled from a fetched veterinary or physiology page, not a scraped summary. Dog and cat heart rates come from Merck’s cardiovascular chapter; the five small-mammal heart rates come from Merck’s cross-species resting-rate table and its species-specific data tables, with the gerbil rate filled from a University of Bristol vet-school fact file and the chinchilla rate (the one gap in Merck and VCA) from LafeberVet. Dog lifespans use the AKC size bands, corroborated by Urfer’s 169,000-dog study; the cat band uses Cornell. Wild-reference body mass and maximum lifespan are AnAge’s adult-weight and max-longevity fields; wild heart rates come from Levine’s 1997 review, the 2019 PNAS blue-whale study, and standard veterinary vital-sign references. Chart coordinates were computed from a representative mid-range value per animal on log–log axes; the dashed line is the textbook allometric fit, heart rate ≈ 241·kg−0.25.

Gaps

Dog heart rate is the softest column. Merck gives adult dogs a single size-dependent range of 60–120 bpm and does not break it out by size class; the higher small-breed and puppy figures (up to ~140–160 bpm) come from vet-reviewed care charts, and the sometimes-quoted 180–220 bpm for toy dogs or puppies could not be confirmed in Merck or VCA, so the table caps small and toy dogs at ~140 and marks those and the giant-dog rate with a leading “~”. Cat rate is shown as a resting 140–220; Merck’s 180–220 is explicitly a stressed clinic rate, and a calm home cat usually sits lower. The chinchilla heart rate rests on a single source (LafeberVet) that other references contradict (100–150 bpm), so treat it as provisional. A blue whale has no true single “resting” rate — its heart swings from about 2 bpm on a dive to ~37 at the surface, and the chart plots a representative low value. Body-mass and lifespan ranges vary by breed, sex, housing and care; the figures are typical bands, not guarantees, and none of this replaces a veterinary exam.

When to call a vet

Three steps, in order. If a sign appears in more than one step, treat it as the higher one.

Watch at home
  • One vomit or loose stool, then normal energy, appetite and drinking.
  • A single skipped meal in an otherwise bright, playful animal.
  • Mild itching with no broken skin, no smell and no hair loss.
  • A sneeze or two with clear eyes and a normal appetite.
Book a vet
  • Signs that persist or return rather than settling.
  • Off food, or noticeably thirstier than usual.
  • Limping, an eye held shut, a new lump, or an ear that smells or is shaken constantly.
  • Weight you can feel coming off through the ribs and spine.
  • Any change at all in a very young, very old, pregnant or already-unwell animal.
Go now
  • Difficulty breathing, choking, or gums that look pale, blue or grey.
  • Collapse, a seizure, or an animal you cannot rouse.
  • Cat A male cat straining in the litter tray without producing urine.
  • Dog A swollen, tight belly with restlessness and retching that brings nothing up.
  • Known or suspected poisoning — chocolate, grapes and raisins, xylitol, antifreeze, human medication, or lilies for cats.
  • Dog Heatstroke: collapse, confusion, or heavy panting that does not settle as the dog cools.
  • Heavy bleeding, a road accident, or a fall from height.

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