I'd already been thinking that I hadn't done enough impulse control/It's Yer Choice/distraction work with Chimera. I don't feel like it's my strong suit (I'm better at teaching tricks... classic clicker trainer problem), so I just kept putting it off. However I now realize that's become a real problem, because I haven't given Cai the foundation he needs to succeed in agility class.
To be fair, I have at least taken other classes specifically to work on focus around other dogs, and before his reactivity started we did lots of little bits of training while out for socialization. In a few weeks we're doing a three week class at Braveheart called Strength, Balance, and Body Awareness. Really looking forward to it!
I'm trying to think of all the attention games I've seen other trainers do:
Ask dog to get into heel position or front and give eye contact while you hold treats or toys out to the side as a distraction. (Did this today!) Later, ask for heeling while you hold them out/move them around.
Heel past distractions. Heel up to food/toy at dog's eye level (ie on chair), keeping leash short enough that dog can't reach if he goes for them. Reward turning away.
Have treats/toy on floor while you ask for behaviors, blocking if dog tries to go for them. (I did this when he was a baby, but over time forgot about it.)
Raise the challenge level on stays (which I have barely worked on). Yesterday I was able to drop treats and he would hold his stand-stay, which pleasantly surprised me. I can also walk back and forth in front of him. I can start throwing more stuff at him.
Recalls, sends, and/or retrieves past temptations.
Classical conditioning may help. In some contexts, Chimera orients to me when he hears dogs barking. Perhaps I could CC other dogs moving -- it would help with his reactivity, too.
Finally, a good ol' "leave it" cue, which I haven't bothered to teach him.
Of course, just going out to different places and asking for behaviors is also helpful. I've started doing this again. (I had stopped almost entirely for the past month or two due to his reactivity.) But we spend most of the time working on leash walking and reactivity training, with just a teeny bit of extra behaviors when the environment is quiet.
If my readers have any other suggestions, I'd love to hear them!