Understanding Degenerative Myelopathy in Dogs

Degenerative myelopathy (DM) is a progressive spinal cord disease that gradually affects a dog’s ability to walk, starting in the hind legs and eventually spreading further. It’s often compared to ALS (Lou Gehrig’s Disease) in humans. It isn’t painful, but it is serious, and there’s no cure. What you can do is understand it clearly, catch it early, and give your dog the best possible quality of life for as long as you can.

What is degenerative myelopathy?

Degenerative myelopathy (DM) is a neurological disease that affects the spinal cord, disrupting the signals between the brain and the limbs. It starts in the hind legs and, over time, can affect the front limbs, bladder and bowel control, and eventually breathing and swallowing.

A mutation in the SOD1 gene is the most significant known risk factor. But having the mutation doesn’t mean a dog will definitely develop DM, it raises the risk. Researchers are still investigating whether other factors, including autoimmune responses, also play a role.

Unlike hip dysplasia or arthritis, DM doesn’t cause pain. Your dog’s mind also stays sharp. DM doesn’t affect mental alertness, so even as their body changes, they’re still fully present and engaged with you.

Symptoms of degenerative myelopathy in dogs

DM symptoms typically start appearing around age 8, though the range can be anywhere from 4 to 14 years old. They begin subtly: you might notice your dog dragging their back paws, crossing their hind legs when walking, or struggling to get up after lying down. Throughout all of this, DM is not painful, which is important to know as you watch for changes.

• Early signs: Wobbling rear legs, knuckling paws (walking on the top part of their feet), worn-down nails, and occasional stumbles.
• Mid-stage symptoms: Significant weakness in the hind legs, frequent falls, difficulty standing, dragging of the back legs, and increased scuffing.
• Late-stage symptoms: Full paralysis of the hind limbs, loss of bladder and bowel control, and eventual impact on the front limbs and respiratory system.

DM can sometimes be confused with other conditions like hip dysplasia or arthritis, so it’s important to consult your vet if you notice any of these behaviors.

What causes degenerative myelopathy in dogs?

The most significant known risk factor is a mutation in the SOD1 gene, which is responsible for producing a protein that helps protect cells from damage. Carrying this mutation increases a dog’s risk of developing DM, but doesn’t guarantee it. Researchers are still working to understand the full picture, including whether autoimmune responses are part of the equation.

DM isn’t caused by injury, lifestyle, or anything your dog did. If your dog is a breed prone to DM, it’s worth asking your vet about genetic screening.

Diagnosing degenerative myelopathy in dogs

Here’s something important to know upfront: DM can’t be definitively diagnosed while your dog is alive. Confirming it with certainty requires examining the spinal cord after death. What vets do in the meantime is rule out other conditions, many of which are treatable, to reach a working diagnosis.

• Physical exams: Your vet will assess your dog’s mobility, reflexes, and neurological responses.
• Imaging tests: MRIs or X-rays help rule out spinal injuries, tumors, or slipped discs.
• DNA tests: Screening for the SOD1 mutation can show whether your dog carries the gene associated with higher DM risk.
• Spinal fluid analysis (cerebrospinal fluid, or CSF): A sample of fluid from around the spinal cord can help rule out other diseases, like infection or inflammation, that might be mimicking DM’s symptoms.

These tests exist to give you and your vet the clearest possible picture, and to make sure nothing treatable is being missed.

Managing degenerative myelopathy

There’s no cure for DM, and the disease will progress. Most dogs live six months to three years after diagnosis, depending on how early it’s caught and how fast it moves. What rehabilitation and supportive care can do is extend your dog’s mobile, comfortable time… and that matters enormously.

Rehabilitation and therapy

Physical therapy can slow the disease’s progression. Hydrotherapy, using a pool or underwater treadmill to help your dog exercise without bearing their own weight, is a popular and effective option. Regular walking, range-of-motion exercises, and massages can also help maintain muscle strength and flexibility.

Mobility aids

Tools like dog wheelchairs, rear harnesses, non-slip booties, and ramps can make a huge difference. These aids help keep your dog mobile and independent, even as their condition progresses.

Home modifications

Simple changes like laying down rugs for traction, setting up ramps, and creating a comfortable resting area can make daily life easier for your dog. These small adjustments can significantly reduce stress for both of you.

End-of-life considerations

When your dog reaches the point where they’ve lost all mobility, bladder and bowel control, or the ability to breathe comfortably, it’s worth having an honest conversation with your vet about what comes next. Choosing euthanasia at the right time isn’t giving up, it’s one of the most compassionate decisions you can make for a dog you love.

Your dog will likely stay mentally alert and connected to you right up until the end. That matters. The time you have together, even in the later stages, is still meaningful.

Does pet insurance cover degenerative myelopathy?

Yes, Lemonade Pet covers neurological conditions like DM under the base accident and illness policy, as long as the condition isn’t pre-existing, meaning signs appeared after your policy was active and your waiting periods had passed. For rehabilitation, the Physical Therapy add-on can help cover PT sessions like hydrotherapy or assisted exercises, which are often central to keeping your dog comfortable and mobile as DM progresses.

Caring for a dog with DM takes a lot, emotionally and financially. Diagnostics, regular vet visits, and rehabilitation costs can climb faster than most people expect, and it helps to know what support is available before you’re in the thick of it.

Before we go

A DM diagnosis is hard news. But your dog doesn’t know what the diagnosis says, they just know you’re there. Whether that looks like hydrotherapy sessions, a new wheelchair, or just more time together on the floor, every bit of care counts. Your vet is your best guide through this, and you don’t have to have it all figured out at once.

Frequently Asked Questions

A few quick words, because we <3 our lawyers: This post is general in nature, and any statement in it doesn’t alter the terms, conditions, exclusions, or limitations of the policies issued, which differ according to your state of residence. You’re encouraged to discuss your specific circumstances with your own professional advisors. The purpose of this post is merely to provide you with info and insights you can use to make such discussions more productive! Naturally, all comments by, or references to, third parties represent their own views, and Lemonade assumes no responsibility for them. Coverage may not be available in all states. Please note that statements about coverages, policy management, claims processes, Giveback, and customer support apply to policies underwritten by Lemonade Insurance Company or Metromile Insurance Company, a Lemonade company, sold by Lemonade Insurance Agency, LLC.  The statements do not apply to policies underwritten by other carriers.