Is there a special way to tell if a dog is inbred?

Sadly to say in the USA a lot of breeders inbreed their dogs to make money. Yes inbred dogs are "BLOND", you can find this out by bringing its sister to him and seeing if there is an attraction. HAHA just kidding. Is your sheperds ears falling? Hip problems early? Most of the problems with sheperds will happen way earlier then normal, if it is inbred. Just spend more time with the dog and try to teach it more.