Mongrel dogs are interesting because you never know what could be in their DNA. You could try to guess by how they look.
For fun, I borrowed The Mutt Book. It provides a simplistic way of decoding your dog’s heritage by helping you identify the type of ears, head shapes, body shapes, types of coat, tail, paws and legs, etc. And where they could have come from. For greater accuracy, I also considered trying out a DNA test on Donna. But I haven’t yet. Should I?