Hi there,
it might be that he currenlty doesn't accept you as the leader and sees himself higher up the rank. The nipping might mean that he is trying to get rid of everything that could get your attention (a form of jealousy) or that he is trying to protect you.
If he had accepted you as the leader previously it will be easy to get back to that. It often happens that people start sending their dogs the wrong signals once they feel the dog is well trained and once they have established the pack status. Dogs are constantly observing us to see if we are still worthy of leading them.
It might also be that he is bored and is looking for a vent. If he gets attention from you when he does it then that is exactly what he wants.
Remove him in a matter of fact way whenever he tries to do that and put him in a quiet place for a few minutes. That way he will realize that biting other dogs taisl will get him nowhere.
Let us know what you think and how you get on.
John
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