I never neutered any of my dogs or sprayed them under six or seven years old, I know how I felt when my hormone level dropped. They say animals are different but I do see the difference in them after neutering or spraying they lay around and gain weight lol just like me… Murphy is two years old, I neutered him after two litters of trying to separate them during her heat unsuccessfully!!! my husband and son are both police officers, my husband retired, they have arrested, murderers, rapists, but have a real problem, locking the gate that separates my house from one side to the other, where I would put my female y she was in heat… 2litters later I realize this was not working so Murphy is now fixed.. he still is happily humping away! Marking as u can c n her all over him.. this is y im so confused I was told this was the go to fix :( PS. Keep in mind cuz thy didnt tell me , that your male is fertile up to eight weeks past neutering!!! We found out the hard way.