@DebraDownSouth Thanks Debra, you've given me a lot to think about. I think I'll start immediately with the "leave it" training at home and then get in touch with some trainers/behaviorists in my area. I'm not expecting any miracles here but, like you said, even just learning to ignore other dogs would make such a difference.
Fence fighting & redirected aggression
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My 7 yr. old B, Rocket, is a fence fighter. At home with the 2 shih tzu's next door he will race up and down the fence, hair raised, and attack the fence. If my female, Rumor, is helping, he will turn and snark at her too. At daycare, he bit one of the helpers when they were bringing a dog in. It is always when he is at the fenceline or on a leash that this occurs. What do I do when this happens?