I took my 13 yr old Great Pyrenees to the vet for the routine removal of a benign mass growing out of her pad. While in their care she was somehow injured (prior to the procedure). She has completely loss the use of her back legs. She tries to walk on them after resting and can go a few feet before collapsing. Her legs were already weak but nothing like this. When I apply gentle pressure all over her body she gives no indication of pain. This just happened today and I have lost what little confidence I had remaining for the vet.