How do you know what type of dog you have?

If your dog is a purebred and you don't know what breed he is, you can check websites, such as those for the American and United Kennel Clubs, to read descriptions, see pictures, and match him up.

If your dog is a mixed breed, you can make a guess based on his prominent features, but it's impossible to know for sure without a DNA test--and even those aren't 100% accurate, as they don't test for every dog breed in the world. DNA breed tests cost about $60-$100 USD, and you can find several online.