Why is my dog limping? When to watch, and when to see a vet

It's late, your dog is holding up a paw, and the internet is already showing you surgery photos. Take a breath. Most limps are a cut pad, a thorn, a pulled muscle, and most of the rest still give you a day or two to act sensibly. What you need tonight is to rule out the emergencies, then examine the leg like a vet would: from the ground up.

Go to a vet today, not tomorrow, if any of these is true: the leg takes no weight at all. It hangs at an odd angle, or a joint is visibly swollen. Your dog cries or snaps when it's touched. There was a car, a fall, or a fight. The limper is a puppy, because growing bones break and warp differently. Or the limp comes with fever, low energy, or a skipped dinner, which makes it a sick dog, not a sore leg.

None of those? Then you have time, and you can find out a lot with your hands and your phone.

Start at the paw

The majority of sudden limps in otherwise healthy dogs live here, and owners skip straight past it to worry about hips. Look at the pads for cuts, cracks and burns; hot summer pavement is a classic. Spread the toes: grass seeds, thorns, stones and clumps of tar hide between them. Check every nail, because a torn nail is agony and invisible under fur. Compare the whole paw with its twin on the other side for swelling.

Then up the leg

Run both hands slowly up the leg, squeezing gently as you go, and do the same on the good side so you know what normal feels like. You're feeling for heat, swelling, or one spot that changes your dog's face. Watch the face, not the leg: a lip lick, a stiffened neck, a whale-eyed glance are how dogs say "there".

Then watch the walk

Have someone walk your dog toward you and away at a slow pace on grass or carpet. The body gives the leg away. A head that bobs up as a front leg lands means that front leg hurts. A hip that hikes upward means the back leg on that side. A bunny-hopping, swaying gait in both back legs points at knees or hips rather than anything in a paw.

What you see maps onto stories vets know well:

The picture	The usual story	How fast
Sudden limp after a walk, paw licking	Pad cut, thorn, torn nail	Your home check may solve it
Big dog suddenly won't use a back leg	Cruciate ligament	Vet within a day or two
Small dog skips a back-leg step now and then	Slipping kneecap	Appointment, not urgent
Stiff after rest, walks out of it, older dog	Arthritis	Appointment, worth having
Limp plus fever or several sore joints	Tick-borne or immune disease	Promptly

Film it tonight

Here is the thing nobody tells you: limping dogs walk beautifully at the clinic. Adrenaline is a painkiller, and many a vet has watched a "terrible limp" trot across the consult room while the owner despairs. So film the limp while it's happening: side-on and from behind, whole dog in frame, decent light, fifteen seconds, slow motion if your phone offers it. That clip is worth more than any description you'll manage from memory. Send it to Petus and you'll get a straight read on whether this is tonight, this week, or watch at home; for a limp specifically, video beats a photo so clearly that Petus will say so if you send a still.

The three rules while you wait

No human painkillers, ever: ibuprofen and paracetamol poison dogs at small doses, and a masked limp is a lie anyway. No test walks to "see how it is"; lead-only garden breaks are the right dose of movement. And 48 hours is the limit: a mild limp that hasn't cleared after two days of rest gets an exam, and a limp that keeps returning over weeks gets one too, because come-and-go is how joint disease introduces itself.