Oops. Sorry about the title spelling. It should be, How Old should he be for the snip-snip. Ok, so my vet recommended that I schedule my pup to be neutered at 6 months. But my trainer and groomer highly recommend that I wait until he is 9 months. They feel that doing the surgery any earlier may cause behavioral issues. The vet says to do it at 6 months to prevent marking inside the house, and that you need to do this before he starts lifting his leg. What do you guys think?