Originally Posted by BullPunk77
from what i have been told by vets and also by a doberman breeder that it does not have major impact on the growth of your dog that it is all about genetics, nutrition, and excercise. we neutered tuck between 5 and 6 months and he is now 11 months and outweighing and taller than my dad's 3 year old apbt
On your very large breeds aka Mastiffs if you neuter or spay them early there can be a chance they do not meet there proper height (to be 26" but ends at 25") this is not proven only a myth. As just like us we have very tall parents but we end up being 5'5.
BullPunk is correct proper diet, and exercise will help the dog out greatly.