… try to determine the breed of a dog by having a veterinarian do an expensive DNA test, but unless you can trace the dog back to its breeder and it was a registered dog, with registration papers, it can still not be called a “purebred”. As such most …

… never try to force you not to visit. An excellent dog breeder will insist that if you have to give up the dog no matter how old the dog is that you can give the dog back. (You won’t get any money back, but at least the dog will have a home).