Since Chimera has to be pottied on leash even in the yard, I got him a new harness that is easier to put on and take off. I can't keep a harness on him all day because it makes his fur mat within 24 hours. (This dog could spend all day sleeping at home and still end up with mats.) The one I got was the Ezy Dog harness:
Fortunately after adjusting his atlas/C1 (at the top of the neck/spine) and massaging his shoulder muscles, he calmed down considerably. And the Ezy Dog harness went into the donation pile.