TL;DR: Joint cracking in dogs is usually a harmless occurrence known as crepitus, but you should see a vet if it is accompanied by pain, swelling, or limping.
Why does my dog's body make a cracking sound when they stretch?
Hearing a clicking or popping sound when your dog stretches is a relatively common occurrence known as joint crepitus. Similar to when a human cracks their knuckles, these sounds are often caused by gas bubbles (usually nitrogen) shifting within the synovial fluid of the joint, or by tendons and ligaments moving over bony structures. In many cases, particularly in older dogs, it is a sign of normal age-related changes in the joint capsule.
Is it an emergency if I hear my dog's joints cracking?
- The urgency level for joint cracking is typically low if your dog is stretching naturally and acting like their usual self.
- Schedule a routine examination with your veterinarian if the cracking is accompanied by whimpering or a reluctance to move.
- Seek professional advice if you notice swelling around the joint or a visible change in your dog's gait.
How can recording a video of the cracking sound help my veterinarian?
- Capture a video of your dog moving to help the veterinary team assess intermittent joint sounds.
- Provide visual context regarding your dog's posture, facial expressions, and weight-bearing habits.
- Use digital documentation to bridge the gap between home observations and clinical orthopedic assessments.
Clinical Context (Merck Veterinary Manual)
Joint cracking (crepitation) in dogs during stretching or movement, particularly during full extension and flexion, can be associated with underlying joint abnormalities such as hip dysplasia or cranial cruciate ligament rupture. Clinical signs may include lameness that worsens after exercise, a "bunny-hopping" gait, reduced range of motion, pain, and joint laxity. Medial meniscal injury may also present with a clicking sound during locomotion or joint manipulation. Diagnostic tools include radiography to assess for arthritis, degenerative changes, and joint effusion, as well as specific techniques like the tibial compression test to evaluate cranial cruciate ligament laxity. Arthrocentesis may reveal mild cellular increases and hemarthrosis.
Chapter: Orthopedics, Immunology
Source: The Merck Veterinary Manual, 11th Edition (Page 1198)