Hi everyone, Rebel will be turning 11 months old this May, and there's a behavior I've been trying to work on stopping, which is excessive barking. He doesn't do it all the time, it's not boredom barking, and there are only two times when he does it - when he's playing with Bonnie (which is a fair bit), and when the neighbor's dog starts up. I understand the other dog triggering it, because territory and all that, and I understand to some extent why he does it with Bonnie and playing, because that's a way to initiate play, and also he's quite dominant, definitely the dominant of the pair. (If you don't already know, Rebel is a pure border collie from working lines, Bonnie is also a pure (but unpapered) BC from working strains, but she has a much milder temperament usually - Didn't know if that would be relevant but I know BC's can be a handful - I've had a few haha).
What I need to stop is excessive barking. He does it when he plays or gets excited, and it's REALLY annoying. What worked with Bonnie 'No!', worked a treat, doesn't work as well on him. I know he's likely to be harder to train because he's a male, and I haven't ever trained a male dog before, only had females since I was very young (am now just turned 17), so I guess I'm not used to the rigmarole involved. He's smart as hell, knows his tricks and his place in the pack, and picks up new things quickly (with or without my assistance..), but this is the one issue he won't stop with, even though I'm absolutely certain he knows he shouldn't be doing it. I've tried making him less excited, telling him 'No', and playing with Bonnie separately to make a point to him (sometimes works with things like treats for other behaviors I've cured him of). Don't know if I'm doing it right or what, I've sort of developed my own set of training techniques with him and Bonnie, some work for them both, others only Bonnie. In any case it's very insistent, loud and annoying. I wouldn't mind some barking, but he barks, growls, and bites Bonnie excessively and it's LOUD, let me say. Also I think it's affecting Bonnie, since we got Rebel she's been SO downtrodden, and she never does anything wrong anymore but she still acts like she's being scolded 24/7 every day - yet I never say no to her, only cuddles and pats. So, any tips?