How cold is too cold for dogs?

When the temperature drops, it’s important to think about how cold weather affects our pups. Is it always safe for them to be outside? How long can they withstand low temperatures? We spoke to Dr. Aliya McCullough, Fetch’s Chief Veterinary Officer and Director of Veterinary Affairs, to learn how to monitor your pup’s safety in colder weather. We’ve also created a Cold Weather Safety Chart as a quick reference guide.

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What determines how cold is too cold for a dog?

Size

Your pup’s size helps determine when it’s safe for them to play outside in the cold. Use caution when the temperature dips below 45 degrees Fahrenheit (around 7 degrees Celsius). It’s potentially unsafe for little or medium-sized dogs with thin coats to be outside, but big dogs with heavier coats are probably okay. When the temperature drops to 20 degrees Fahrenheit and below, all dogs are at a higher risk of hypothermia and frostbite, so it’s best to limit your dog’s time outdoors as much as possible.

Coat weight

Coat thickness plays a role in determining when it’s too cold for dogs to be outside. Breeds like Siberian Huskies, Samoyeds and Newfoundlands have denser coats and are usually more comfortable in colder temperatures. But dogs with thin coats, like Greyhounds or Xoloitzcuintles, should bundle up when the temperature is below 45 degrees Fahrenheit. 

Moisture in the air 

Always consider the weather elements when taking your dog outside. Walking your dog in rainy, windy, foggy and overcast conditions when it’s below 32 degrees Fahrenheit isn’t the best idea.‍

‍Familiarity with cold weather ‍

Your dog’s level of comfort in colder climates also plays a role. If they’re a cold-friendly breed (like Siberian Huskies) or are used to being outdoors in colder temperatures, then it’s okay to trust your individual pup’s comfort level. ‍However, dogs generally shouldn’t sleep outside, especially in temperatures below 45 degrees Fahrenheit.

Supervision‍‍

Stay close to your dog while they’re playing outside so you can monitor any changes in behavior due to the weather. If the temperature is below 45 degrees Fahrenheit, it’s too cold for dogs to swim. And if you plan on leaving your dog in the car for a few minutes on a cold day, make sure to keep the heat running.

Hypothermia is also important to keep in mind. If your dog starts showing signs of hypothermia — shaking, lethargy, stiff muscles, low heart rate or dilated pupils — it’s important to act quickly. Call your vet, move them into a warm area and cover them with blankets. You can also incorporate heating blankets or bottles, but make sure to put several layers between the heating elements and the dog to avoid burning the pup’s skin. Your vet can help give you more specific guidance on next steps.

Remember: you are your dog’s best advocate when it comes to cold weather safety, so if you feel uncomfortable, chances are your dog does, too. (Now that you’ve studied up on keeping dogs safe in the cold, be sure to check out our hot weather guide, too.)