What to Do If Your Dog Is Favoring One Leg

How to Spot Lameness in Your Dog

When a dog favors one leg, it may not always show a clear limp. Instead, subtle signs like shifting weight or altered posture can indicate pain. Start by watching your dog stand relaxed, ideally from 8 feet away, to avoid influencing their stance. A dog with a sore front leg may place that foot ahead of the other, while a sore rear leg often causes the pelvis to lean toward the opposite side. The tail may hang closer to the good leg to help redistribute weight.

You can also look for a smaller foot on the sore side—when a dog avoids putting weight on a leg, the foot flexes into a more compact shape. A head tilt or leaning to one side may also signal discomfort. These signs are especially useful when lameness is mild or intermittent.

Watch Your Dog Move to Confirm Lameness

Observe your dog walking and trotting. If a front leg is sore, the dog’s head will rise when the painful leg touches the ground and drop when the healthy leg bears weight. For a rear leg issue, the pelvis lifts when the sore leg hits the ground. These movements are natural weight-shifting responses to pain.

To confirm your observations, try the “flex test”: gently lift and hold the suspected leg against the dog’s body for a full minute, then let the dog trot forward. This often makes lameness more obvious. You can also videotape your dog trotting and review the footage in slow motion. Having a second person watch the video can help catch subtle signs you might miss.

Check for Common Causes of Lameness

Lameness can stem from injuries, joint problems, or muscle strain. Begin by examining the foot and toes. Look for cuts, thorns, broken nails, or swelling. Many cases of lameness are caused by minor foot injuries that are easy to miss.

Next, gently press along the leg from the toes to the shoulder. Feel for areas of tenderness, swelling, or resistance when moving the joints. If the dog pulls away or resists movement, that’s a sign of pain. Compare the affected leg to the opposite one—this helps you distinguish normal from abnormal.

When to See a Veterinarian

If your dog continues to favor a leg after a few days, or if you notice swelling, limping, or reluctance to move, it’s time to consult a vet. Chronic lameness or pain that worsens over time may indicate a deeper issue like joint disease, ligament damage, or nerve problems. Early diagnosis improves treatment outcomes.

Even if the lameness seems minor, a vet can use tools like the cornstarch test—trotting the dog over a mat dusted with cornstarch—to objectively measure asymmetry. This test helps confirm subtle lameness that’s hard to see with the naked eye.

Use Objective Tools for Better Assessment

For more accurate evaluation, use the cornstarch test. Place a ¼-inch layer of cornstarch on a rubber mat at least 40 feet long. Trot your dog in a straight line at a steady pace. The footprints will show uneven pressure—more cornstarch on the good leg, less on the sore one. This provides visual proof of lameness.

You can also use video analysis to study head and pelvis movement frame by frame. These tools are especially helpful for owners new to spotting lameness. Combining observation with objective testing increases accuracy and supports better communication with your vet.