Introduction
The most common symptom of ACL injury in dogs is sudden onset of lameness. Additional symptoms include pain, stiffness, and sitting or laying down with the leg in an awkward position.
Symptoms of ACL Injuries in Dogs
ACL injuries in dogs usually occur suddenly even though the ACL may have been experiencing wear and tear for quite some time. Most ACL injuries occur when a dog is engaged in physical activity such as playing, running, or jumping up or down. Pet owners may notice their dog suddenly stumble and then limp thereafter. Often a dog will hold the leg up and keep it at an odd angle. Depending on the severity of the injury, the dog may just limp, or only occasional step down on the leg, or the dog may refuse to use the leg at all.
When an ACL injury occurs, a dog may or may not show signs of pain. Some dogs display no signs of pain even if they are suffering from severe injuries, and so limping may be the only noticeable sign of an ACL injury. In some cases, swelling around the knee may become noticeable. The dog will often sit in an awkward position, and in cases where an ACL injury occurred in both legs the dog may refuse to get up or walk.
ACL injuries will worsen over time if they are not treated. Dogs with mild to moderate ACL injuries may show just a tendency to limp, and then gradually become completely lame as the injury progresses.