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How cold is too cold for dogs?
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Vets give rough lines: from about 45°F (7°C) the most cold-sensitive dogs can feel chilled, at 32°F (0°C) most dogs start to be at risk from the cold, and below 20°F (−7°C) even cold-hardy breeds need watching closely.
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Size, coat and body fat move those lines a lot. Small and thin dogs lose heat faster; dogs with a dense double coat, like Alaskan Malamutes and Pomeranians, cope far better than single-coated breeds like Whippets. Long hair alone is not the same as a warm coat.
Wind, wet fur and how long the dog is out all count as much as the thermometer. These are general guidelines; a vet knows the dog in front of them.
What I think of too cold for dogs
Some dogs see snow and lose their minds with joy. Others look at you like you have betrayed them.
A husky at 20°F is having the best day of its life. A Whippet at 40°F is filing a complaint.
Dogs do not check the forecast. They check your face, then the door.
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Source: Jennifer Coates, DVM, reviewed by Hannah Hart, DVM, “How Cold Is Too Cold for Dogs?” on Chewy’s education pages.