You are now linked in the amputation bulletin board. Have you talked about orthotics with doc? They can be right pricey with the human type, a mold is made of the foot and a custom made cushion comes back. I have had it done.
For someone with crafting and clay throwing abilities, this might be something that can be done at home. The tempurpedic foam might be an option. They sell it in pads and pillows, so you wouldn't have to buy the whole mattress.
This could be slipped into a http://www.handicappedpets.com/splints/
, depending on the angle of the foot. Can you post a photo?
As critters says, they usually do better without the deformity at all, than trying to compensate for it. It seems so drastic but actually, it gives relief. Please see critters' link, viewtopic.php?f=11&t=7201
. I use the Amazon site to 'pre-read' any book I purchase. Some I can read the whole book.
Also, I just posted for the Irish collie, some massage info for atrophy. Let me do a copy and paste Slowly with your fingertips, pull down on the leg going deep enough to hit some subqutaneous tissues and watch for pain.
Keep doing this and at the joints, wiggle your fingers not quite as deep, to not only get blood flow and oxygen to the tissues but IT FEELS GOOD
Dianne has linked some PT for parapups in the paralysis forum that are SO EXCELLENT. viewtopic.php?f=4&t=10626
The PT is down about half way under MASSAGE, but I think there may be several links you might benefit from.
and thank you so much for what you are doing!