Short answer: below 32 F, start taking care. VCA says whenever temperatures drop below freezing, it is time to take precautions.
VCA says to limit walks to 5 to 10 minutes when it is below 20 F, and to protect your dog with a coat and booties. It says it is generally not safe to leave dogs outside in winter. The AKC says to make sure your dog is dry before a walk, because wet areas are more vulnerable to frostbite, and describes hypothermia as a dangerous condition in which the core body temperature drops too low.
VCA warns that leaving a dog in a car can be dangerous in winter as well as in summer. See winter paws, a dog who refuses a coat and boots.
If your dog is shivering, weak or unusually quiet in the cold, warm them up gently and call your vet.
This article is general education, not veterinary advice. If your dog seems unwell, is in pain, or something changed suddenly, call your vet. If it could be an emergency, do not wait.
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This guide does not cover medical care. It is background on clear, calm handling at home.
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