The difference between dogs and reptiles lies in the fact that people have breed dogs for thousands of years, we have 10's of thousands of vets trained in dog care and genetics. Most vets are damn near completely ignorant when it comes to reptiles. Many if not most of the possible ailments of reptiles cannot be diagnosed from your everyday vet.

I've got an AKC bloodhound that I had wanted to breed but when I was getting ready to consider breeding her I took her to vet for a complete check up. It was found that she had a heart murmur and that it would potentially genetically passed down, so we got her fixed rather than breeding her.

I cannot take my breeder reptiles to the vet to check for much of anything thus cannot be 100% confident that there are no possible genetic aliments that could potentially affect its offspring so I could not guarantee that without lying threw my teeth and just hoping and praying I never get called out on it. Thats not how any responsible breeder would conduct business.

A short story proving that this kind of guarantee would not work because of vets is summed up by the guy that called me last month. He had bought a spider from someone, its head wobbled , he took it to the vet who proclaimed it was IBD and even though his spider was eating, growing, thriving.... The vet put the spider down telling the guy that it was necessary for the survival of the rest of his collection.