Why is my dog limping?

A dog that suddenly starts hopping on three legs or holding a paw up gets noticed fast, and that is genuinely useful, because it usually means something happened just now rather than a slow problem that has been building for months. That is a different picture to the gradual stiffness covered in how to help a dog with arthritis, which tends to show up as slowness and reluctance rather than an obvious limp. A dog limping today has almost always hurt itself, or is in the early stage of a joint injury that will not simply fix itself with time. Here is how to work out which.

Start by looking, not touching

Before handling the leg, watch your dog move a few steps if they are willing. Are they putting any weight on it at all, or holding it completely off the ground? Check the paw itself next, gently, spreading the toes to look for a thorn, a grass seed, a piece of glass, or a torn or bleeding nail, since a lodged object or nail injury is one of the most common and most fixable causes of a sudden limp.

An ordinary sprain from an awkward landing

Dogs are athletic but not immune to bad luck, and a missed step off a curb, an awkward landing after jumping for a ball, or a scuffle at the park can cause a straightforward sprain or soft tissue strain. This kind of limp is often worst in the first hour or two and improves steadily with rest, and a dog that is still willing to put some weight on the leg, is alert, and is behaving normally otherwise can reasonably be rested and watched for a day, kept to lead-only toilet trips rather than free running.

The hind-leg injury that does not just get better

One cause deserves its own section because it gets mistaken for an ordinary sprain constantly, and treating it like one wastes the window where treatment works best: a torn cranial cruciate ligament, the knee ligament that stabilises a dog’s hind leg. It is one of the most common orthopaedic injuries in dogs, especially in larger, active, or overweight dogs, and it can happen from something as ordinary as an awkward turn while running, not just a dramatic fall.

Larger and giant breeds carry a higher lifetime risk of this injury, which is worth knowing if you have a Labrador, a German Shepherd, or another big, active dog, though it can happen in a dog of any size. A vet diagnoses it with a physical exam and sometimes imaging, and treatment ranges from strict rest and physiotherapy for a partial tear in a smaller dog through to surgical repair, which is the more common recommendation for larger or more active dogs. Confining a recovering dog to a crate or a small pen for the weeks a vet recommends matters more here than with almost any other injury on this page, since reinjuring a healing or repaired ligament is a real setback.

Fractures and serious trauma

A fall from real height, being hit by a car, or a heavy object landing on a leg can cause an actual fracture, and this is not something to guess about at home.

Growing pains in a large-breed puppy

A young, fast-growing dog, particularly a large or giant breed, that limps on and off with no obvious injury may be dealing with a developmental joint problem such as elbow or hip dysplasia rather than a one-off accident. This tends to show up as an intermittent limp that comes and goes, sometimes worse after exercise or after a long rest, rather than the sudden onset of an injury. It is worth a vet visit rather than assuming a puppy will simply grow out of it, since some developmental joint conditions respond far better to management started early.

Shifting-leg lameness after a tick

If your dog has recently had a tick, spends time in long grass or wooded areas, or lives somewhere ticks are common, a limp that seems to move from one leg to another over a few days, sometimes with a fever or reduced appetite, can be a sign of a tick-borne illness such as Lyme disease rather than a mechanical injury. This pattern, lameness that shifts leg rather than staying put, is unusual enough in an ordinary sprain that it is worth mentioning to your vet specifically.

What to do while you decide

Confine your dog to a crate, pen, or small room, and limit them to short, lead-only toilet trips rather than free running or off-lead walks, whatever the suspected cause turns out to be. Resist the urge to repeatedly flex and feel along the leg to test it yourself, since this risks causing more pain without telling you anything a vet’s exam would not tell you more safely. Watching how the limp changes over the following day, genuinely improving, staying the same, or getting worse, alongside checking for the wounds, swelling, or shifting-leg pattern described above, is usually enough to judge whether you are looking at a minor strain settling down or something that needs a proper diagnosis. When in doubt, especially with a dog that will not use the leg at all, treat it as the latter. Our guide on the signs your dog is in pain is worth reading alongside this if you are unsure how much discomfort your dog is actually in, and for an older dog with recurring stiffness rather than a fresh injury, a joint supplement such as Dasuquin with MSM is sometimes recommended alongside a vet’s diagnosis, though it supports a chronic joint rather than fixing an acute one.