Most dogs have a built-in fur coat and are fine during the colder months. Most dog coats are for the comfort of the owner as opposed to that of the dog. But are there any dogs that do need a coat for the cold?
Tiny dogs and thin short-haired dogs are breeds that will benefit from a coat. If you live in a city, your dog may need special shoes so that their paws aren't irritated by the salt put out to melt the snow. A dog that needs shoes is not necessarily a dog that needs a coat. Don't leave your dog out in the cold for too long, even if they have a coat on.
Greyhounds get cold easily and almost always need a coat.
Chihuahuas are another breed that a coat is a good investment for.
“A dog that needs shoes is not always a dog that needs a coat”
St. Bernard dogs most certainly do not need a coat.
These sled dogs don't need coats, but some have shoes.
Whippets have similar statures to Greyhounds and will also need a coat.
Samoyed dogs are bred for the ice and snow. The have quite a lot of fur.