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Heatstroke is a summer killer of small pets — and cold torpor a winter one — because they can’t tell you they’re in trouble. Pick your species and enter the room temperature to see whether it’s in the safe range, straight from our fact-checked care data.
Comfortable range: 20–23°C (68–73°F) · cold danger at 18°C (64°F)
Keep them warm, about 20–23°C — cold triggers torpor in this tiny species.
Source: Lang et al. 2020, J. Vet. Behavior — dormouse welfare · full african pygmy dormouse care guide →
Comfortable range: 18–21°C (64–70°F) · heat danger at 24°C (75°F) · cold danger at 15°C (59°F)
Aim for 18–21°C indoors. Above the low-20s take cooling care; below ~15°C risks a dangerous torpor.
Source: RSPCA — Creating a good home for hamsters · full campbell’s hamster care guide →
Comfortable range: 10–18°C (50–64°F) · heat danger at 25°C (77°F)
Chinchillas have the densest fur of any land mammal and cannot shed heat well — heatstroke is one of the top killers. Keep the room cool (ideally 10–18°C); above about 25°C is genuinely dangerous. Never let a room get hot.
Source: RSPCA — Creating a good home for chinchillas · full chinchilla care guide →
Comfortable range: 18–21°C (64–70°F) · heat danger at 24°C (75°F) · cold danger at 15°C (59°F)
Aim for 18–21°C indoors. Above the low-20s take cooling care; below ~15°C risks a dangerous torpor.
Source: RSPCA — Creating a good home for hamsters · full chinese hamster care guide →
Comfortable range: 15–20°C (59–68°F) · heat danger at 25°C (77°F)
Degus are heat-sensitive and should be kept below about 20°C, out of direct sun. Rising above the mid-20s risks heatstroke.
Source: RSPCA — Creating a good home for degus · full degu care guide →
Comfortable range: 20–25°C (68–77°F)
Keep this desert gerbil warm and dry, about 20–25°C — damp and cold cause illness.
Source: Royal Veterinary Center (exotics clinic) — Duprasi care sheet · full fat-tailed gerbil care guide →
Comfortable range: 15–24°C (59–75°F) · heat danger at 26°C (79°F)
Ferrets overheat easily — heat stress can begin around 26°C, and 30°C is genuinely dangerous, worse still in high humidity or in an ill ferret. Signs include collapse, drooling and rapid breathing; keep them cool and shaded.
Source: Vetlexicon / LafeberVet — Heat stress in ferrets · full ferret care guide →
Comfortable range: 18–26°C (64–79°F) · cold danger at 15°C (59°F)
Keep flying squirrels warm indoors — cold triggers torpor. Normal comfortable room temperature suits them.
Source: WebMD (veterinarian-reviewed) — Can I have a pet flying squirrel? · full flying squirrel care guide →
Comfortable range: 18–24°C (64–75°F)
A desert species that likes normal, dry room temperatures — keep it warm and dry, out of direct sun, cold draughts and damp.
Source: RSPCA — Creating a good home for gerbils · full gerbil care guide →
Comfortable range: 17–20°C (63–68°F) · heat danger at 26°C (79°F) · cold danger at 15°C (59°F)
Ideal is 17–20°C. Above 26°C guinea pigs risk fatal heatstroke; below 15°C they get chilled and should be moved indoors. Keep them out of direct sun and away from radiators.
Source: RSPCA — Creating a good home for guinea pigs · full guinea pig care guide →
Comfortable range: 18–21°C (64–70°F) · heat danger at 24°C (75°F) · cold danger at 15°C (59°F)
Aim for about 18–21°C (up to ~26°C is tolerated). Take cooling care above the low-20s. Below ~15°C a hamster can slip into a dangerous hibernation-like torpor — pet hamsters lack the reserves to survive it, so keep them warm indoors.
Source: RSPCA — Creating a good home for hamsters · full hamster care guide →
Comfortable range: 24–29°C (75–84°F) · heat danger at 32°C (90°F) · cold danger at 20°C (68°F)
A hedgehog needs a thermostatically-controlled 24–29°C — this is the make-or-break factor for the species. Below about 20°C it may attempt a dangerous hibernation (a cold, wobbly hedgehog is an emergency); above ~32°C it can overheat.
Source: Merck Veterinary Manual — Management of Hedgehogs · full hedgehog care guide →
Comfortable range: 18–24°C (64–75°F) · heat danger at 27°C (81°F) · cold danger at 15°C (59°F)
A comfortable room temperature suits mice; keep them out of direct sun and heat, and away from cold draughts. Tiny bodies gain and lose heat fast, so avoid extremes either way.
Source: RSPCA — Creating a good home for mice · full mouse care guide →
Comfortable range: 18–24°C (64–75°F)
Keep the enclosure around 21°C, out of direct heat, with at least one open/ventilated side.
Source: VCA Hospitals — Prairie Dogs: Housing · full prairie dog care guide →
Comfortable range: 10–20°C (50–68°F) · heat danger at 25°C (77°F)
Rabbits struggle to lose heat and can begin to overheat from about 25°C — heatstroke is a summer killer, so give shade and never leave them in a hot room or car. They’re cold-hardy if kept dry and draught-free.
Source: PDSA — Heatstroke in rabbits · full rabbit care guide →
Comfortable range: 19–23°C (66–73°F) · heat danger at 27°C (81°F) · cold danger at 15°C (59°F)
Keep rats at a steady 19–23°C. They cool themselves through their tails and cope poorly with high temperatures — move the cage somewhere cooler in a heatwave and never leave it in sun or a hot car.
Source: RSPCA — Creating a good home for rats · full rat care guide →
Comfortable range: 18–21°C (64–70°F) · heat danger at 24°C (75°F) · cold danger at 15°C (59°F)
Aim for 18–21°C indoors. Above the low-20s take cooling care; below ~15°C risks a dangerous torpor.
Source: RSPCA — Creating a good home for hamsters · full roborovski hamster care guide →
Comfortable range: 23.5–26.5°C (74–80°F) · cold danger at 20°C (68°F)
A warmth-dependent tropical marsupial — keep it about 23.5–26.5°C; it chills easily below that.
Source: ILAR Journal — laboratory husbandry of Monodelphis · full short-tailed opossum care guide →
Comfortable range: 21–26°C (70–79°F)
Keep spiny mice warm, about 21–26°C — they’re a desert species and dislike the cold.
Source: Haughton, Gawriluk & Seifert 2016, JAALAS — spiny mouse husbandry · full spiny mouse care guide →
Comfortable range: 18–21°C (64–70°F) · heat danger at 24°C (75°F) · cold danger at 15°C (59°F)
Aim for 18–21°C indoors. Above the low-20s take cooling care; below ~15°C risks a dangerous torpor, which pet hamsters can’t safely survive.
Source: RSPCA — Creating a good home for hamsters · full syrian hamster care guide →
Comfortable range: 18–21°C (64–70°F) · heat danger at 24°C (75°F) · cold danger at 15°C (59°F)
Aim for 18–21°C indoors. Above the low-20s take cooling care; below ~15°C risks a dangerous torpor.
Source: RSPCA — Creating a good home for hamsters · full winter white hamster care guide →
Ambient (room) temperature, not body temperature. Ranges are the fact-checked safe zone — humidity, direct sun and illness all make heat more dangerous, so err on the cool side for heat-sensitive species. Heatstroke and cold torpor are emergencies: contact a vet.
It depends on the species, but heat is dangerous sooner than most people think. Chinchillas can’t shed heat and are at risk above about 25°C; guinea pigs risk fatal heatstroke above 26°C; rabbits can start to overheat from 25°C; rats cope poorly in a heatwave; and ferrets can suffer heat stress above 30°C (or lower in humidity). Small pets can’t tell you they’re overheating, so keep them cool, shaded and never in a hot room, conservatory or car.
Chinchillas are the most heat-vulnerable of all — their ultra-dense fur traps heat and heatstroke is a leading killer. Guinea pigs, rabbits and degus are also very heat-sensitive and need a cool room in summer. Because none of them sweat effectively, prevention (shade, airflow, cool tiles, frozen bottles wrapped in cloth) matters far more than trying to cool an animal that’s already collapsed.
Hedgehogs are the classic case — below about 20°C they may attempt a dangerous hibernation, and a cold, wobbly hedgehog is an emergency. Hamsters can slip into a life-threatening torpor below about 15°C, and tiny species like the African pygmy dormouse and flying squirrel also go torpid in the cold. These species need reliable warmth indoors, never a cold garage, shed or conservatory.
Warning signs include lying stretched out and floppy, fast or laboured breathing, drooling or salivating, weakness, reddened ears, and eventually collapse. Heatstroke is a life-threatening emergency: move the animal somewhere cool, offer water, dampen (not soak) it with cool — not ice-cold — water, and contact a vet immediately. This tool helps you prevent it, but it never replaces urgent veterinary care.
