Many breeds result from a small amount of animals, which leads to mating in kinship. The effect is different hereditary (genetic) illnesses which are common in some breeds, for instance, hip dysplasia (specifically in German shepherds), epilepsy, ataxia, oculoskeletal dysplasia, among others.
Source of your dog
The canines can be split into crossbreeds and breeds with a pedigree and a new breed with out a pedigree.
Non-doggy breeds (hybrids): they are the result of an unintended mating (crossing) of different varieties of dogs or dogs whose resource is unknown.