TL;DR: A sudden leg injury during activity is likely a CCL tear or soft tissue damage; while usually not a life-threatening emergency, your dog needs a vet visit within 24-48 hours.
Why is my dog suddenly limping or holding up a leg?
- Sudden yelping and lameness during high-impact activity usually indicate an acute orthopedic or soft tissue injury.
- The most common cause is a Cranial Cruciate Ligament (CCL) tear, the canine equivalent of a human ACL injury.
- Other possibilities include a torn toenail, a foreign object stuck in the paw pad, a muscle strain, or a bone fracture.
When is my dog's leg injury considered a veterinary emergency?
- Medium Urgency: Most cases require a veterinary exam within 24 to 48 hours to manage pain and prevent further damage.
- Immediate Emergency: Seek care right away if you see an open wound, a visible deformity, or if your dog is completely unable to stand.
How can providing a photo or video help the veterinary triage process?
- Photos of the specific limb help the vet identify signs of swelling or abnormal joint angles.
- A short video of your dog attempting to walk helps the vet assess the degree of lameness.
- Visual evidence can significantly speed up the diagnostic process during your appointment.
Clinical Context (Merck Veterinary Manual)
Sudden yelping and limping during fetch can be caused by several factors. Traumatic hip luxation, most frequently a craniodorsal displacement of the femoral head, presents with lameness, pain during hip manipulation, and a shortened limb. Cranial cruciate ligament rupture can also cause acute lameness due to excessive trauma, possibly exacerbated by weakened ligaments from degeneration, immune-mediated diseases, or conformational defects. Diagnosis of lameness involves assessing the limbs distally to proximally, noting any swelling, pain, instability, crepitation, reduced range of motion, or muscle atrophy. Serial examinations before and after exercise, and imaging techniques such as radiography, ultrasonography, CT, or MRI, may be required for diagnosis. Sedation may be necessary for fractious animals to facilitate palpation, radiography, and arthrocentesis.
Chapter: Orthopedics
Source: The Merck Veterinary Manual, 11th Edition (Page 1199)