Dog suddenly cannot use its back legs
A dog that suddenly cannot use its back legs, is dragging them, is wobbly and weak at the back end, or cries out and won't move its back is a go-now emergency. A common cause is a slipped or ruptured spinal disc (IVDD), and in some breeds a clot can also cause sudden back-leg paralysis. The speed of veterinary care can directly affect whether your dog walks again, so do not wait. Keep your dog as still as possible, support the body when you lift, avoid twisting the spine, and get to a veterinarian or emergency hospital now.
Go to a vet now if
- Sudden inability to use, or dragging of, the back legs
- Crying out, a hunched or rigid back, or refusing to move
- Wobbliness or weakness that is worsening
- No feeling in the toes, or loss of bladder control
Call a vet today if
- Mild stiffness or a slight limp that improves with rest in a comfortable dog
What to tell the vet
- When the weakness started and how fast
- Whether your dog can feel or move the toes
- Any pain, crying, or a hunched back
- Recent jump, fall, or known back problems
- Bladder and bowel control
- Breed, weight, and age
What not to do
- Do not let your dog jump, run, or twist — keep the spine still
- Do not give human painkillers — many are toxic to dogs
- Do not delay — the sooner the vet assesses the spine, the better the outlook
What your vet may check
Your vet will examine the spine and reflexes, assess sensation, and may use imaging to find a disc problem or other cause. Treatment ranges from strict rest and medication to emergency surgery, depending on severity.
Recovery support after veterinary assessment
Recovery often involves strict crate rest and a careful rehabilitation plan — follow your vet's instructions closely, as overactivity can undo progress. Supportive nutrition during recovery is used on veterinary advice.
Frequently asked questions
Why can a dog suddenly lose the use of its back legs?
A common cause is a slipped or ruptured spinal disc (IVDD), which presses on the spinal cord. In some breeds a blood clot can also cause sudden back-leg paralysis. Both need urgent care.
Is sudden back-leg paralysis an emergency?
Yes. How quickly the spine is assessed and treated can affect whether your dog walks again, so keep your dog still and get to a vet immediately.
How should I move a dog that can't use its back legs?
Support the whole body, keep the spine straight and still, and avoid twisting. Use a board or carry a small dog flat. Do not let them jump or struggle.
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Sources & standards
Emergency guidance follows AVMA, Merck Veterinary Manual, ASPCA Animal Poison Control, and small-animal emergency-medicine standards, reviewed by our veterinary advisory board.