The most notable symptom differentiating dm from the other potential causes for old dogs’ back legs collapsing is that the dog will experience no pain. If the nerve injury is suspected to be permanent and the animal is chewing the leg, amputation may be the best option. My Dog Cannot Support Its Hind Legs Whats Wrong Dog cannot walk with left side legs. Dogs back legs not working and diarrhea . Their tail may still wag as they lie on the floor, unable to stand. It could be an infection in the intestines causing so much inflammation that the nerves to the hind limbs are affected. On thursday night, my dog was walking around with her head down but not in circles. Keeping towels under the dog may absorb messes. Ivdd happens when the disc cushion between the bones of the spine breaks down and presses on nerves branching off the spinal cord. The sudden nature of this problem would suggest that it has been caused by a sudden event, which has resulted in a loss of. Other...