I hope all is going well with Shelby
My dog has hip dysplasia, so we've found a way to train/challenge her without too much movement.
We do a bit of clicker training while 'targeting' places or items with a stick. It helps her stretch, think, interact with us etc without too much switching back from sits to downs to walking etc. She tries to figure out what to do to the items we're pointing at for that click. We still do regular training, since she's not totally immobile, but this helps make up for her not having too many activities right now.
Clicker training is oddly easy if you follow a few rules. We did one lesson with a trainer to get us started, and are now using a book by karen pryor called 'Getting Started: Clicker Training for Dogs'. That's were we got the pointing and 'box playing' ideas to help without too much repetitive movement. It is such a simple method though, that just online references can keep you busy for a good while. I have a feeling it's one of those 'easy to learn, hard to master' type things. I'm very impressed so far.
Oh, another note, pain can influence a dog's temperament alot. Her having to quickly readjust her body weight etc might explain her reacting so drastically to particular behaviors. Glad the collar isn't a contact spot anymore.
She sounds great and i'm glad you are taking so much effort in working with her. kudos to you, she's a lucky dog
. -adri