I have 2 male pups (brothers) that were neutered at 4 months and 6 months. They are now almost 9 months old. While Tucker (4 months) has not really gained much weight since he was neutered - Sparky still continues to gain (he was done at 6 months. So I am still not sure what the affect of neutering has done to their physical development. Neither one has changed behavior at all Tucker is still the dominate dog of the house
BTW: To those of you that do agility/rally/obiedience - is that limited to purebred dogs also? Tucker has had basic obedience classes but I want to do something more with him. He can jump a 4 foot fence, almost made it over the 6 foot and "thinks" through problems but he is a mixed breed.

BTW: To those of you that do agility/rally/obiedience - is that limited to purebred dogs also? Tucker has had basic obedience classes but I want to do something more with him. He can jump a 4 foot fence, almost made it over the 6 foot and "thinks" through problems but he is a mixed breed.