I bought an online training course but only used part of it. Brodie was never reactive until covid and then became increasingly so. My neighbors think he is a 'vicious' dog... but he's not, he's just reactive. I think having Deacon also increased his reactivity - he feels the need to protect his flock. And it didn't help that I have this jerk of a neighbor who loves to drive by my house always revving his engine right as he passes my house which REALLY increased Brodie's car reactivity - the neighbor didn't HAVE to, he could drive up the road on the opposite side of the hill, I really think he did it to push buttons. He has since stopped, he's a prev divorced older man who is now dating a women who has a dog who is far, far more reactive than Brodie could ever been - he behaves better now.. lol!
I had been working with my husband for months during walks. Making the boys, not hubby - haha, sit and 'watch' as cars went by and then rewarding them if they did. But after months, nothing was really working, and my husband - who always had Brodie - just doesn't get how attentive he needs to be. It's our responsibility to see the action as it starts and redirect it before it becomes an issue. In the course I bought, the lady starts by having a reactive dog at its 'safe' distance from something it reacts to, then rewarding - alot - to keep the dogs attention on food instead of what it reacts to. She says that if done slowly, you should eventually be able to walk the dog past what it reacts to and have it focused on the treats instead of the reactive thing.
I switched up my walks; purposely walking without my husband so I had both dogs on my own. For a month and a half, I kept a ton of treats in my left pocket and always walked with treats in my hand for the times a car would drive by or a neighbors dog would bark. On my own, I was uber successful with Brodie. Now when we walk together, we've switched up the dogs - I take Brodie and he takes Deacon. I can now get Brodie to not give a hoot if the Fed Ex truck whizzes by us, we've even been able to walk by a dog in our neighborhood that Brodie ALWAYS reacts to. The dog is passive aggressive and the owner doesn't clue in on it - the dog is nice, but stares down other dogs, not just my own, and I think they are scared of him cuz the owner doesn't break his stare. I've been working with both dogs in my classes; Deacon is timid around dogs so classmates are encouraging him to come near and then treating him. Bodie is reactive so the trick has been to keep him so focused on a treat that another dog can come up. Wednesday, Brodie actually let a big Golden Retriever come up behind him and take a treat over Brodie's head - it was so cool to see. Brodie even snuck a sniff when Thor walked away - amazing progress!
Of course, there are a few downsides to our new walking routine... yesterday while out for a walk it was Deacon, with hubby, who barked at a different dog. The real trick in success, for me, has been being uber, uber intent on my dogs. I am constantly talking to and in particular watching them. A prick of an ear, the head going up, tail coming up, a prance style walking on tip toes starts - I watch for signs and then start tossing treats. A side benefit has been that Deacon is getting better at catching tiny treats tossed for him. It's really been being consistent and observant more than anything and redirecting his focus. And Brodie is learning... he's catching on that cars and trucks mean treats afterward IF he just continues walking. I use homemade treats that are maybe a 1/2 calorie each and I did take him to the vet to be weighed and he's not gaining weight but I did have to cut back on one of his meals to account for the extra food he is getting. Sorry for the very long reply...