All of a sudden (as of a couple of weeks ago) my unneutered male dog has been showing dominance (growling, snapping) to some male dogs and puppies. It's only three specific male dogs he really does it with. He used to be incredibly submissive to all dogs, but has now changed.
I have been correcting him as much as possible (walking past dogs with my dog on a lead and giving a small tug on his prong for correction if he so much as gives them the look).
Any advice would be appreciated.
Sergeant Charlie Vom DonGossen