What is a sign of patellar luxation in a Jack Russell Terrier?

Limiting use of a leg is indeed a clear sign of patellar luxation in a Jack Russell Terrier. This condition occurs when the kneecap (patella) dislocates or moves out of its normal position. When this happens, the dog may experience pain and discomfort, leading it to favor the affected leg and limit its use. This behavior can manifest as reluctance to engage in activities that require running, jumping, or climbing stairs, and may make them hesitant to put weight on the affected leg when they do move.

In contrast, excessive barking, weight gain, and lack of interest in play are not specific indicators of patellar luxation. While they might correlate with other health issues or behavioral problems, they do not directly relate to the mechanical and painful aspects of this knee condition. Such signs could point to various concerns, but they do not provide clear evidence of an issue with the kneecap itself. Therefore, recognizing the limiting use of a leg is critical for identifying patellar luxation accurately in Jack Russell Terriers.