So it looks like she walks down on her hocks (heels) right? In that case, I'd suggest http://www.handicappedpets.com/walkin-rear-splint
. If she has NO foot drop, you might be able to get away with only the hock splint, but, personally, I would just get the full splint right out of the gate so as to cover both and not have to worry about it again. I also happen to REALLY like these HP splints because they're nice quality, washable, etc. Personally, I'd have at least 1 spare as well, but that's probably just me. The foam is nonabsorbent, so there's not much to getting them dry. I just always have spares of everything, especially important stuff.
AH! I see there are 2 links there; I only saw the 1 pic. Lemme go watch the video and see if I change my "prescription."