Every breed, and why it is on the list.

23 breeds, each with its own page: the mechanism that makes it vulnerable, the published odds where they exist, whether it can swim, the gear that earns its place, the daily care its anatomy needs, and the risks particular to it. Same data the app scores your dog with — not a rewrite for the web.

23 breeds9 with published odds13 in the app’s picker

The evidence behind the ranking

Hall, Carter & O'Neill 2016, VetCompass analysed UK primary-care veterinary records covering more than 900,000 dogs and reported the odds that a dog of each breed had ever presented with heat-related illness, measured against the Labrador Retriever.

The odds are for whether a dog of that breed ever presented with heat-related illness. They set the RANKING; they are not a multiplier on how long a dog may be outside, and the app never uses them as one.

AffenpinscherA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.AirwayHeat-vulnerability multiplier 1.7×

Boston TerrierA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.AirwayHeat-vulnerability multiplier 1.7×BoxerA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.AirwayHeat-vulnerability multiplier 1.7×BullmastiffA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.AirwayHeat-vulnerability multiplier 1.7×

Cavalier King Charles SpanielA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.Airway3.45× odds3.45 odds of heat illness against a Labrador Chow ChowA dense coat holds heat against the skin, so cooling lags well behind what the weather looks like.Coat16.61× odds16.61 odds of heat illness against a Labrador

Dogue de BordeauxA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.Airway5.31× odds5.31 odds of heat illness against a Labrador

English BulldogA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.Airway13.95× oddsCannot swim13.95 odds of heat illness against a Labrador English Springer SpanielA dense coat holds heat against the skin, so cooling lags well behind what the weather looks like.Coat2.74× odds2.74 odds of heat illness against a Labrador English Toy SpanielA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.AirwayHeat-vulnerability multiplier 1.9×

French BulldogA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.Airway6.49× oddsCannot swim6.49 odds of heat illness against a Labrador

Golden RetrieverA dense coat holds heat against the skin, so cooling lags well behind what the weather looks like.Coat2.65× odds2.65 odds of heat illness against a Labrador GreyhoundBuilt to sprint, which means outrunning your own cooling is possible long before it starts to feel wrong.Sprint metabolism4.26× odds4.26 odds of heat illness against a Labrador Griffon BruxelloisA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.AirwayHeat-vulnerability multiplier 1.7×

Japanese ChinA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.AirwayHeat-vulnerability multiplier 2.3×

Labrador RetrieverThe reference breed every published odds ratio is measured against.The study’s reference breed Lhasa ApsoA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.AirwayHeat-vulnerability multiplier 1.6×

NewfoundlandA dense coat holds heat against the skin, so cooling lags well behind what the weather looks like.CoatHeat-vulnerability multiplier 1.9×

PekingeseA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.AirwayCannot swimHeat-vulnerability multiplier 2.3×PomeranianA dense coat holds heat against the skin, so cooling lags well behind what the weather looks like.CoatHeat-vulnerability multiplier 1.6×PugA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.Airway3.24× odds3.24 odds of heat illness against a Labrador

Shih TzuA shortened muzzle moves less air, so the heat that panting sheds leaves the body more slowly than it arrives.AirwayHeat-vulnerability multiplier 1.7×Staffordshire Bull TerrierA heavy body makes heat faster than its surface can lose it, and it stays hot for longer afterwards.Body massHeat-vulnerability multiplier 1.6×

Not on the list?

Every other dog gets the same model.

The breed table changes the starting multiplier, not whether the app works. For a mix or a breed not here, setup asks the two questions that matter — whether the muzzle is short, and how they breathe — and an unsure answer always resolves toward the cautious reading.

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