All the vets and experienced breeders you have dealt with? That doesn't mean they are right. I have had a lot of dogs over a 60 year span, mostly males and I have never had a dog develop testicular cancer.
I know of a very well known Bull Mastiff breeder that has a lifetime warranty on his dogs. He is very specific on what to feed them, exercise regimens etc etc. He will void the warranty if they are spayed or neutered. He recommends if it has to be done to do it after they are fully mature which takes a Mastiff 3 1/2 years or so.
