before we got our puppy we where given what seems like the third degree from the breeder and i was happy to go along with it, i knew she cared for her pups and their welfare that was over 12 years ago, and because of her when i bred a litter under her guidance, the potential owners where vetted by me, and if i did not think a puppy would be suitable for them i would tell them, this may seem harsh to some people but i tried my best for my pups to make sure they where going to the homes that where best for them.
Some breeders may also require vet refs,so don't be worried they are just trying to do their best for their pups.
carol