Yes, neutering him CAN still help. Have you thought about belly bands?
Here's some previous threads on neutering and belly bands. Good luck! And welcome to YorkieTalk and our Yorkie community! What is your Yorkie's name? We look forward to seeing pictures of him and hearing stories.
http://www.yorkietalk.com/forums/sho...ht=belly+bands http://www.yorkietalk.com/forums/sho...ht=belly+bands http://www.yorkietalk.com/forums/sho...ht=belly+bands http://www.yorkietalk.com/forums/sho...ht=belly+bands