TL;DR: Paw dragging, or knuckling, is a sign of nerve or spinal issues that requires a veterinary exam within 24-48 hours, or immediately if your dog cannot stand. Capturing video of your dog's gait can significantly help your vet diagnose the severity and cause of the movement problem.
What does it mean if my dog is knuckling or dragging its paws?
Dragging the hind paws, often referred to as "knuckling," occurs when a dog is unable to properly lift or place their feet while walking. You might notice a scuffing sound or see the tops of their nails wearing down. This is typically a sign of a neurological or orthopedic issue affecting the communication between the brain and the limbs, causing the dog to walk on the tops of their feet rather than the pads.
Is my dog dragging its paws a medical emergency?
- The urgency level for paw dragging is generally considered Medium, requiring a veterinary exam within 24 to 48 hours.
- While it may not be an immediate life-threat if the dog is otherwise stable, it indicates significant nerve or spinal involvement.
- Critical Emergency: If your dog suddenly loses the ability to stand, seems in extreme pain, or loses bladder control, seek immediate emergency care.
How do photos or videos of my dog’s movement help with triage?
- Providing a video of your dog's gait allows professionals to see the specific pattern of movement and which paw is most affected.
- Visuals help the team determine if the issue is consistent or intermittent.
- Photos of the tops of the paws can show physical trauma or wear from dragging, helping determine the chronicity and severity of the condition before you arrive.
Clinical Context (Merck Veterinary Manual)
Sciatic nerve injuries can cause a dog to drag its hind paws, as the sciatic nerve or its branches may be damaged by pelvic fractures, during or after retrograde placement of intramedullary pins in the femur, or by injections of irritating substances in or near the nerve. This results in the dog bearing little or no weight on the affected limb and dragging the dorsal surface of the paw. Avulsion of the caudal nerve roots causes loss of sensation on the caudal surface of the limb with variable loss on the cranial surface. Amputation of the limb may be necessary due to damage from dragging or self-mutilation; however, recovery is possible in mild cases in which the roots are contused rather than avulsed.
Chapter: Neurology
Source: The Merck Veterinary Manual, 11th Edition (Page 1244)