Some breeds do especially poorly in cold. Greyhounds, for instance Rihanna more than a game Rihanna face , have very short hair and almost no body fat. They are so cold intolerant that their owners will sometimes put them in coats or pajamas indoors during the winter. Working, herding and sporting dogs that are exposed to frigid air or water temperatures should be on a high-fat, high-protein performance diet. If your dog is shivering, remains curled up, or won’t leave its shelter, it is probably too cold. Bring it inside. (I’m not big on the idea of “outside dogs,” but I recognize that some working dogs may need to stay out to do their jobs. These dogs should have a well-insulated shelter to which they can retreat.) Depends on the breed and the size. Depends on by outside you mean walking them or letting them live outside. For any of the husky type breeds, it can be pretty cold. They’re actually happier in the cold than the heat.
But if you’re going to keep them outside, they need a dry, insulated space with either heat or bedding and no wind below certain temperatures. And you have to make sure that they have a water source that does not freeze. For little short-haired dogs, I’d let them out but not take them for a long walk once it’s below 20 degrees Fahrenheit. You can get the coats and even booties if you really wanted to take them for a long walk. I would not keep them outside without heated quarters. (If you’ve ever seen a short-haired terrier type shivering outside, you’ll know why.) Also, check the tips of their tails and the tips of their ears if you have them out in the extreme cold for any length of time. Check between their nail pads if you have them out in the snow. Wipe their paws if you’re walking them someplace that uses salt. We don’t live in a climate where it gets much colder than that and even that kind of cold doesn’t last for more than a week to ten days.