Introduction
Many dog owners tell me something like, “Oh, he has always walked like that,” or “She’s always been a bit sitting that way.”
It becomes normal to us because our dogs adapt so well. They smile, they walk, they play — and we think everything is fine, even when signs of pinched nerves and muscle loss are slowly developing.
And when the change happens gradually over months or even years, it’s not easy to notice until the difference becomes clear with lameness, back pain, etc.
I also meet owners who are really into sports such as obedience, tracking, or other hobbies with their dogs. They train regularly, and everything seems fine — until someone else points out that the dog isn’t using a leg the same way as before, or that something looks “off.”
Very often they tell me, “I didn’t notice it myself. It was my friend or trainer who told me to check the dog.”
So it’s not that owners don’t care or don’t pay attention. It’s simply that dogs are incredibly good at adapting, and small changes in movement are easy to miss, even for people who work closely with their dogs.
When Muscle Loss Is Linked to a Nerve Issue
Muscle loss in dogs often develops so gradually that you get used to the change and don't notice anything until it has been ongoing for a while. especially in furry dogs, where you can't really see because of the long fur.
A thigh gets a bit smaller, your dog starts taking shorter steps, or they shift their weight without you noticing.
Most people naturally think one thing:
“My dog must be weak. Maybe we need more walks.”
And in many cases, more activity helps. But there is another situation — one that exercise alone can’t fix. Sometimes the problem isn’t the muscle at all. It’s the nerve that controls the muscle.
How Nerve Irritation Affects Muscle
For a muscle to stay strong, it needs a clear, steady signal from the nerve.
If that signal is reduced, the muscle simply can’t work properly, even if your dog still walks, plays, and behaves normally.
Nerve irritation in dogs often comes from small issues in the lower back or pelvis such as:
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stiffness around the lumbar spine
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a slightly irritated spinal joint
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a small disc bulge
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tension or dysfunction in the sacroiliac joint
These are not dramatic injuries.
They are everyday, subtle problems that can affect how the nerve communicates with the muscle.
And when a nerve doesn’t signal well, the muscle slowly starts to shrink.
This is called neurogenic muscle loss — but in simple terms:
The muscle can’t grow because the nerve can’t “talk” to it properly.
Why Dogs Don’t Always Show Pain
This part is important.
Dogs do not always show pain the way we expect. Many dogs with a pinched nerve:
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walk normally at first
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keep playing
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wag their tail
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seem happy and fine
They hide discomfort incredibly well.
Instead of limping, they often:
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take shorter steps
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avoid putting weight on one side
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sit crooked
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hesitate on stairs
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struggle to jump into the car
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or start losing muscle on one leg
To most owners, these look like “little changes. But they can be early signs that a nerve isn’t functioning as it should.
Why Exercise Alone Doesn’t Work
This is where dog owners often feel confused.
You walk your dog.
You try small exercises.
You keep them active.
Maybe someone even recommended hill walking or sit-to-stands.
But the muscle still doesn’t return.
You’re doing your best — but when the nerve is irritated, the muscle simply can’t respond well.
It’s like trying to turn on a lamp when the cord is loose.
You can flick the switch all you want, but the power doesn’t reach the bulb.
The same thing happens in the body:
If the nerve isn’t working well, the muscle can’t rebuild.
What Actually Helps
Before a muscle can grow again, the nerve needs attention. This usually means helping the lower back and pelvis move better and calming down irritation around the nerve.
This can include:
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gentle physiotherapy
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improving movement in the back or pelvis
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reducing inflammation if needed
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soft tissue work
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rest from things that aggravate the problem
Only when the nerve starts working normally again will the muscle respond to exercise.
After that, rebuilding strength becomes much easier, and often much quicker than expected.
Signs That May Tell Us It Is a Pinched Nerve
These are signs I often see in dogs with nerve-related muscle loss:
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one thigh smaller than the other
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shorter steps behind
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dragging the toes or scuffing nails
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trouble rising from the floor
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hesitation to jump
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stiffness after rest
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a tucked or slightly arched back
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uneven sitting or standing
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weaker on hills
None of these signs means your dog is “old” or “just like that.” They often mean the body is adapting to some kind of discomfort.
The Takeway
When a dog loses muscle, most people think they need more exercise. Sometimes that’s true, and hopefully that's the most common reason — but not always.
When a dog has pinched nerves, the muscle can’t get the signal it needs to stay strong, no matter how many walks or exercises you do. But once the nerve is supported and working better, the muscle often responds quickly to gentle strengthening.
Understanding this helps owners feel more confident, less confused, and more able to help their dog feel comfortable and strong again.
You might also want to read "how to know when your dog is in pain"
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