TL;DR: Sudden hind limb weakness or paralysis in dogs is a high-priority emergency that requires immediate veterinary evaluation to prevent permanent nerve damage. Providing a video of your dog’s movement can help the medical team quickly assess the severity and prepare for your arrival.
What causes sudden hind limb weakness or paralysis in my dog?
When a dog suddenly loses the ability to stand on their back legs, it is often a sign of a neurological or musculoskeletal crisis. This condition can range from paresis (weakness) to full paralysis and may be caused by:
- Intervertebral Disc Disease (IVDD)
- Spinal trauma
- Fibrocartilaginous embolism (FCE)
- Severe arthritis flare-ups
Is it a veterinary emergency if my dog cannot stand on its back legs?
Urgency Level: High. Yes, an inability to stand on the hind legs is a veterinary emergency. You should seek immediate care if your dog exhibits any of the following:
- Sudden loss of mobility or dragging their legs
- Signs of pain or distress
- Loss of bladder control
- Conditions like IVDD where the window for surgical intervention is very short
How can a photo or video help a veterinarian triage my dog's mobility issues?
Providing a short video of your dog attempting to move is invaluable for triage. A video allows a professional to observe:
- The dog's gait and level of motor control remaining
- The positioning of the paws, such as "knuckling" (where the top of the foot touches the ground)
- Visual information to help the medical team prioritize the case and prepare diagnostics
Clinical Context (Merck Veterinary Manual)
In an emergency setting, acute inability to walk warrants immediate transfer of the animal to the treatment area for evaluation. Severe thoracolumbar spinal cord injury may cause paraplegia, and spinal trauma may progress in cases of unstable fractures or luxations. Radiographs may demonstrate vertebral fractures and luxations, but CT is more sensitive for detecting spinal fractures in dogs with trauma. Acute, painful paraparesis and inability to flex or extend the hock can also result from arterial thromboembolism, often secondary to myocardial disease or other underlying disorders. Clinical signs of arterial thromboembolism include loss of flexor and patellar reflexes, decreased sensation distal to the hock, firm and painful gastrocnemius and cranial tibial muscles, cyanotic nails, and weak or absent femoral pulses.
Chapter: Neurology, Emergency, Surgery
Source: The Merck Veterinary Manual, 11th Edition (Page 1254)