So sorry to hear about your dog,the only thing I can think of that would work is this.
I know from past experiences with this stuff that it works really well,is very durable,and stays on for days,you might want to give it a try and see if it works for her,I think Wal-Mart sells it.It also doesn't need a shaved area for it to work either,since it doesn't stick to anything but itself.
Best wishes and I hope this works:)
Jen is it on the hock?
Here is a great Hock wrap that might work.
And this one that covers the stifle and hock
ADD Jen look at that second wrap in my link it does go over the stifle and might do the trick.
ADD2- Jen take a look at this one no dog could get out of that!!
(A-Trac Dynamic Brace)