Following are some possible causes for a dog’s back legs suddenly giving out by veterinarian Dr. Joanne Fernandez-Lopez. MSD Veterinary Manual.
Knee giving out or Knee buckling is the sudden giving away of the knee as you bear weight.
It may cause falls and fractures in people who suffer from osteoarthritis. Thomas, W.B. Cats with wobbly or weak hind legs will have trouble walking, climbing and jumping. Many treatment options focus on resting the affected area and managing pain, but …

Hip and leg pain are often the result of injury, overuse, or wear and tear over time. Hind leg weakness in dogs : when your dog’s back legs give out. The ACL is most often injured with sudden shifts in direction in non-contact injury situations. Hip pain when walking can happen for a lot of reasons. People with an ACL tear often complain that their knee buckles or wants to give out when they suddenly shift direction. Hip dysplasia is a malformation of the hip joint that can range from mild hip instability to complete hip dislocation. One or both hip joints can be affected. Mobility problems in cats are easy to spot. Thomas, W.B. Intervertebral Disc Disease Anterior Cruciate Ligament (ACL) Tears: The ACL is central within the knee and critical to supporting the joint with cutting and pivoting maneuvers. 2018. However, when there is sudden weakness of the back legs and your dog still is unable to move, this is a symptom that should be evaluated and treated immediately by your veterinarian. Disorders of the spinal column and cord in dogs. Back leg stiffness is common in older cats, but it can also affect younger cats and kittens. Knee buckling, a condition in which the knee seems to collapse suddenly from instability, can be caused by any number of medical conditions, from arthritis to an unstable kneecap. You can experience pain in the hip joint at any age. Disorders of the Peripheral Nerves and Neuromuscular Junction in Dogs. To treat or prevent knee giving away, you can do specific exercises for strengthening the knee muscles and ligaments can improve the stability of joints. Osteoarthritis is the most common cause of cat back leg stiffness. MSD Veterinary Manual. Vetmed. All newborn babies are screened for hip dislocation and/or instability before heading home from the hospital. This primarily occurs in cats aged 10+, and can be diagnosed with an x-ray.

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