It's 10 PM. Your dog comes back from his last walk limping on his front right paw. No visible depression, no cries. He eats, he wags his tail. But he is clearly limping. Do you go to the veterinary emergency room now? Do you wait until tomorrow morning? Do you observe for another 48 hours? 

This is one of the most frequent and distressing questions for owners. And the answer is not always simple, because canine lameness can hide a huge variety of things: a foreign body in the paw pad, a sprain, a fracture, a ligament rupture, early osteoarthritis, growing pains in a puppy, or more rarely bone cancer. This practical guide gives you the keys to quickly assess the situation, guide your decision, and not miss a real warning sign. 

First thing to do: 2-minute assessment

Before panicking or passively waiting, a quick and methodical observation will give you valuable information for your veterinarian. 

Observe your dog walking 

• Which limb is affected? Front? Back? Several? 

• Is he still putting weight on his foot? Or is he lifting it completely? 

• Does the lameness change sides or limbs depending on the time of day? (this is an important signal) 

• Film: dogs tend to hide their pain at the clinic. A few seconds of video can be crucial for your veterinarian. 

Inspect the affected limb 

• Look and lightly touch the pad and the space between the toes: foreign body, cut, foxtail? 

• Look for swelling, deformity, or localized heat. 

• Try to gently flex the limb, only if your dog remains calm: does he react to a particular joint? 

• Never force if the dog resists or shows aggression! This is a sign of intense pain. 

Practical tip 

For forelimbs: watch your dog walk towards you. The head lifts when he puts down the painful limb (to relieve pressure). 

For hindlimbs: watch him walk away. The rump lifts on the affected side.

This is what veterinarians call "Down on sound": the head/hip descends on the sound limb. ( WSAVA Orthopedic Examination Guidelines, 2019 ) 

The triage table: emergency, soon, or monitoring? 

This table summarizes the key criteria used in veterinary medicine to assess the priority of canine lameness. It does not replace a clinical examination but helps you make an informed decision.

Causes according to your dog's age 

Age is one of the first elements your veterinarian considers during a lameness examination. Certain pathologies are almost exclusive to certain age groups. 

Most frequent causes: what you need to know 

Foreign body in the paw pad 

This is the number one benign cause of sudden lameness. A foxtail (the famous small grass that penetrates the skin), a shard of glass, a pebble. Lameness often appears abruptly after a walk in a field or on a path. Carefully inspect between the toes, under the paw pad, and in the interdigital spaces. An untreated foxtail can migrate deep into the tissues and cause serious abscesses. 

Visual representation of a foxtail

Panosteitis ("growing pains") in large breed puppies 

If your dog is a large breed under 18 months old and is limping without identifiable trauma, sometimes on different limbs from day to day, consider panosteitis. It is a painful inflammation of the diaphysis (shaft) of long bones, mainly observed between 5 and 18 months in large breeds (German Shepherd, Golden, Labrador, Rottweiler, Doberman being the most common). Lameness can be severe and shift from one leg to another. Panosteitis is generally self-limiting and tends to disappear at the end of growth, although episodes can recur for several months. Treatment is symptomatic (rest, veterinary anti-inflammatories). 

Cranial Cruciate Ligament (CCL) rupture 

One of the most common causes of sudden lameness in adults, especially in active or overweight dogs. The dog often limps on a hind limb, placing the tips of the toes on the ground (minimal weight-bearing) but not truly bearing weight. The knee joint may be swollen. Partial rupture can cause moderate lameness that seems to improve then worsen. This topic has been covered in another article on the same blog.

Osteoarthritis: progressive lameness and morning stiffness 

Unlike traumatic causes, osteoarthritis develops gradually. The first signs are often subtle: the dog is stiff when getting up in the morning, hesitates to go up stairs, and spontaneously reduces their walking distances. Lameness is generally less pronounced after a good warm-up but increases in intensity if activity is excessive. In a dog over 7 years old, progressive lameness without known trauma often suggests osteoarthritis. However, if it persists, worsens, or is accompanied by swelling, a veterinary check-up is still necessary.

Osteosarcoma: The lameness you shouldn't miss

Bone cancer in dogs is rare but serious, and it often first presents as simple lameness. Giant breeds (Great Dane, Saint Bernard, Leonberger, Rottweiler) are significantly overrepresented. The lameness is progressive, without trauma, worsens regularly, and may be accompanied by a hard, warm swelling on the bone itself (not the joint). Unlike osteoarthritis, the pain is often intense and does not diminish with rest. Any progressive lameness with marked bone pain, especially in a large adult breed, warrants a prompt X-ray to rule out a serious bone cause, including osteosarcoma.

What your veterinarian will want to know

During the lameness exam, they will observe your dog walking and trotting, palpate all limbs (bones and joints), perform flexion-extension tests on each joint, and look for ligament instability. If an area is identified, X-rays will be suggested. Always bring a video taken at home: it is often more telling than what the dog shows during the consultation, where adrenaline can mask the pain.

Mistakes to avoid

• Attributing all lameness to aging. Pain deserves to be treated regardless of age.

• Administering human painkillers (ibuprofen, paracetamol, aspirin): toxic to dogs, potentially fatal.

• Forcing your dog to stretch or walk to assess pain: this can worsen a fracture or rupture.

• Waiting too long without consulting for progressive lameness: certain pathologies (osteosarcoma, complete ACL rupture, IMPA) require early management.

• Not filming: dogs often mask their pain during consultations. Video is a real diagnostic tool.

What you can do now

• Observe and film your dog walking on flat ground.

• Carefully inspect the paw pads, interdigital spaces, and nails.

• Note how long it has lasted, if it shifts between limbs, and if other signs are present (fever, lethargy, loss of appetite).

• Consult the triage table above to guide your decision.

• When in doubt: call your clinic. They can often guide you over the phone.

• Ask your veterinarian what canine pain reliever you can keep in an emergency kit for evenings and weekends.

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Sources

1. Merck Veterinary Manual (2025). Lameness Examination in Small Animals. msdvetmanual.com • Effective Orthopedic Examination (2019): veterinary conference / proceedings relayed by VIN • PetMD: Why is My Dog Limping? (veterinary clinical review)
2. VCA Animal Hospitals: Panosteitis in Dogs
3. Veterinary Information Network (VIN): Panosteitis: Growing Pains in Dogs
4. VetsNow: Limping in Dogs (Triage and Referral)
5. Emergency Vet Hospital: When to See an Emergency Vet for Your Dog's Limp