I wanted to add that it could also depend on how old the pups are when they get spayed. Chuy, my former foster yorkie, was neutered at 4 months, too early IMO. He still had lots of baby teeth at that point. If he were neutered a bit later, say about 8 months, the vet would have had a better idea of what wouldn't come out at that point. he's basically got double teeth now and bad breath.
