Badger, just want to send encouragement and props for what you are doing to foster this dog. I'm sure your efforts will pay off greatly for her in the long run!
We adopted our dog in April after he had been in foster care for some time, and it has become apparent that his foster parents did a lot of work to get him ready for adoption. And I can appreciate that it's no small amount of problem solving and attention and care.
I might try a variation on indigoiis' advice, since our little guy is also not great eliminating on leash, especially since we are currently undergoing a big transition and cannot always stick to our routines.
MD: re feeding, our guy was food deprived when he was found, and was inhaling his food, and while it didn't seem to bother him we did want to slow him down. We got this big metal ball at Petco that sits in his dish and he has to eat around it. It does seem to help, except that on occasion we have placed his dish in a corner and he figured out that he can shove the ball out of the bowl.



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