If you prefer to adopt a mixed breed from the humane society, use the answers to the previous nine questions in Breed Selection to determine which category of dog suits you best: retriever, herder, spitz type, etc.
Evaluating which breed or breeds a mixed puppy will resemble as an adult is, at best, a guessing game for even the most experienced dog professional. The puppy may have the body of one breed and the mind of another. But, even when buying a purebred dog, there is no guarantee the individual you pick will be temperamentally typical of its breed since environment plays a crucial role in shaping personality.
So, don’t necessarily rule out a mix. You take your chances, to different degrees, either way.