TL;DR: Sudden non-weight-bearing lameness in dogs is a medium-urgency concern that requires a veterinary evaluation within 12 to 24 hours to manage pain and prevent worsening conditions.
What does it mean if my dog is suddenly not putting weight on its leg?
When a dog suddenly stops putting any weight on their back right leg, it is a clear sign of significant pain or mechanical dysfunction. This 'three-legged' gait indicates that the dog is unable or unwilling to use the limb for support. It is distressing to watch, but staying calm is the first step in helping your pet.
Is my dog's sudden non-weight bearing lameness considered a medical emergency?
- The urgency level for acute non-weight bearing lameness is Medium.
- While usually not a life-threatening emergency, it requires a veterinary appointment within 12 to 24 hours.
- Seek immediate care if the lameness is accompanied by severe trauma, heavy bleeding, or extreme lethargy.
- Your dog is likely in significant discomfort, and delaying treatment can lead to further injury or inflammation.
How does providing a photo or video help the veterinary triage process?
- Capture a photo of the leg to show visible swelling, an odd angle, or a wound.
- Take a short video of your dog moving to show the gait.
- Visuals help the veterinarian determine if the issue is a paw injury, a neurological problem, or a complex orthopedic issue like a ligament tear.
- Providing media allows the clinic to prioritize your dog's care appropriately before you even arrive.
Clinical Context (Merck Veterinary Manual)
In evaluating a dog presenting with acute, non-weight bearing lameness of the right hind limb, a thorough lameness examination is critical. Observe the animal at rest, rising, and during locomotion on flat surfaces, noting single- or multiple-limb lameness and its severity relative to activity. With hindlimb lameness, the head is dropped during weight bearing on the affected limb and the stride is shortened on the affected side. Assess the limb from distal to proximal, palpating bones, joints, and soft tissues, noting any swelling, pain, instability, crepitation, reduced range of motion, or muscle atrophy. Ancillary diagnostics such as radiography, ultrasonography, arthrocentesis, and advanced imaging techniques (CT, MRI) may be necessary to determine a diagnosis. Sedation with IV butorphanol and acepromazine, propofol, or medetomidine (alone or combined with butorphanol or hydromorphone) may be required in fractious animals to allow for palpation, radiography, and arthrocentesis.
Chapter: Orthopedics, Neurology, Anesthesia
Source: The Merck Veterinary Manual, 11th Edition (Page 1193)