[yorkietalkjilly]

Neutering will likely help the situation but your strong, positive, calm leadership(not the same as dominance) will help also. Watch for 'targeting' when the dogs start to feel prey drive and start to stare for longer than 2 seconds, mouth still and tense, crowd his space or get in his face, put paws or try to get on up his body/mount and know what is considered 'rude' doggie behavior to one another for unfamiliar dogs to do that - don't allow that. Keeping the dogs calm and polite to one another will work wonders with any new dog. I've heard that intact males are continually wanting/needing, according to mother nature's instincts, to mate and frustrated when they can't so solving that situation for your new guy should help. Give it time as he'll likely at first try to keep up his old ways for up to 3 mos. after his surgery until he learns he no longer instinctively wants/needs to mate and gradually learns a new way of life.