[Dudley's Mom]

He has a little 2 month old malti-poo puppy for the last month to play with and now all of a sudden he is being aggressive and jumping on the puppy. Mickey is 5 months old and always been a sweet boy. Do you think maybe it is because he hasn't been neutered yet? I am trying to wait because he only has one testicle that descended. Also he only has lost one tooth and I wanted to see how he did with his teeth before the surgery. Any suggestions would be appreciated. He doesn't bite him, but sounds really aggressive.