Quick answer: dogs with hip dysplasia often lose muscle over the hips and thighs because sore hips get used less. That matters, because those muscles help hold a loose hip joint steady, so losing them can make things worse. The fix is a vet-led plan: pain control, a lean body weight, and controlled strengthening work such as lead walks, physiotherapy and hydrotherapy. A joint supplement can support the joints alongside that plan, but it doesn't replace it.
Transparency note: this page is written by MedPaw, which makes a joint supplement. Sources are linked so you can check them. Checked 9 October 2026.
Why hip dysplasia causes muscle loss
In hip dysplasia the ball and socket of the hip don't fit snugly. The joint is loose, it wears unevenly, and over time arthritis develops. The University of Bristol's Langford Vets note that examining a dog with hip dysplasia may reveal "lameness, hip pain and muscle loss over the pelvis and hind limbs", and the Scottish SPCA lists "muscle loss on affected limbs" among its common signs.
The cause is mostly disuse. A dog with sore hips takes shorter steps, shifts weight forward onto the front legs and avoids stairs and jumping. The muscles of the rump and thigh, which normally drive the back legs and steady the hip, shrink from lack of work. Muscle also seems to matter the other way round: researchers have linked greater pelvic muscle mass with less hip dysplasia in large breeds, although a 2022 study questioned whether that applies to small and medium dogs.
What you might see
Hip dysplasia and muscle: what you might see
| What you notice | What it may mean | What to do |
|---|---|---|
| Narrow back end, thighs and rump thinner than the shoulders | Muscle loss from using the hips less, often because they're sore | Vet check; pain control; strengthening plan |
| Hip bones sticking up more than before | Muscle loss over the pelvis | Vet check; measure and photograph monthly |
| Bunny hopping with both back legs together | Avoiding moving each hip through its full range | Vet check; physio can retrain the gait |
| Leaning forward, front legs looking bulkier | Shifting weight off the hips onto the front end | Pain control; weight management |
| Slow to rise, stiff after rest, reluctant on stairs | Hip pain, often with arthritis developing | Vet check; controlled exercise; home changes |
| One thigh thinner than the other | One hip worse than the other, or another problem in that leg | See your vet; read why one back leg loses muscle |
Red flags: when to see a vet
If your dog has hip dysplasia and you notice muscle loss, mention it to your vet; it's a sign the current plan may need adjusting. Go sooner if:
- Your dog is suddenly much lamer, or won't put a leg down
- They cry out, pant or tremble when getting up
- They can't get up without help, or the back legs collapse
- Muscle loss is getting worse quickly despite exercise
- There's knuckling, scuffing of the paws, or loss of bladder or bowel control, which suggest a spinal or nerve problem rather than the hips
A supplement is not a painkiller. Pain relief from your vet is what lets a dog with sore hips use its muscles properly again. For the full condition guide, see hip dysplasia in dogs: signs and management.
What you can do at home
- Keep your dog lean. Extra weight loads the hips on every step. Ask your vet for a target weight.
- Regular, controlled exercise. Several short lead walks a day on soft, even ground build muscle without jarring. Avoid ball chasing, sharp turns and jumping.
- Strengthening, with guidance. Slow walking up gentle slopes, sit-to-stands and stepping over low poles work the rump and thighs. Ask your vet to refer you to a vet physiotherapist for a plan suited to your dog's hips; see what to expect from canine physiotherapy.
- Hydrotherapy and swimming. Water supports the hips while the muscles work. Read about hydrotherapy for dogs.
- Home changes. Rugs on slippery floors, a ramp for the car and a supportive bed help your dog move confidently.
- Track it. Measure each thigh with a soft tape and take a photo from behind once a month.
Can a supplement help?
A joint supplement won't change the shape of the hip or rebuild muscle. What it can do is support the joints alongside pain relief, weight control and exercise, so your dog is comfortable enough to keep doing the work that builds muscle. Omega-3 fish oil has the strongest evidence for arthritis comfort, so ask your vet about that too. If you'd like a joint supplement, we'd suggest MedPaw Hip & Joint Chews: a soft chew with all six key joint actives and a 60-day money-back guarantee. It contains green-lipped mussel and brewer's yeast, so it isn't suitable for dogs with a shellfish allergy; check with your vet if your dog takes medication.
We look at the evidence for each ingredient in do joint supplements help with hip dysplasia?, and at muscle loss more broadly in the best supplement for a dog losing muscle.
Frequently asked questions
Does hip dysplasia cause muscle atrophy in dogs?
Often, yes. Dogs with sore hips use their back legs less, so the muscles over the rump and thighs shrink. Vets commonly find muscle loss over the pelvis and back legs when examining dogs with hip dysplasia.
Can a dog with hip dysplasia build muscle?
Yes, with the right plan. Once pain is controlled, regular controlled exercise, strengthening work from a physiotherapist and hydrotherapy can rebuild a good deal of muscle. Go steadily, because too much too soon can make the hips sore.
What exercises are good for a dog with hip dysplasia?
Short, regular lead walks on even ground, swimming or hydrotherapy, and gentle strengthening exercises such as slow hill walking and sit-to-stands. Avoid ball chasing, jumping and sudden turns. Ask your vet or a vet physiotherapist for a plan for your dog.
Why does my dog with hip dysplasia have skinny back legs?
Because the hip and thigh muscles have shrunk from less use, while the front legs often look bigger from carrying more weight. It's a sign the hips are probably sore, so it's worth a review with your vet.
Do joint supplements help hip dysplasia muscle loss?
Not directly. They can support the joints alongside pain relief and exercise, helping your dog stay active enough to rebuild and keep muscle. They don't replace vet treatment.
