Q. My 3 yr old 90lb black lab suddenly today has hind leg weakness and walks as if it hurts him. He was fine yesterday.
DESTINI R. HOLLOWAY, DVM
A. Hind leg weakness can be a sign of a number of diseases including Myasthenia Gravis, Tick paralysis, or Intervertebral disc disease. If the hind leg weakness persist for more than a day or two, I would recommend to get your pet examined by an experienced vet who will go through a series of physical tests to help localize the affected area on the leg. Radiographs of the leg and potential bloodwork may be needed as additional testing to come up with an accurate diagnosis, so that the appropriate treatment is recommended.