Why Does Your Dog Keep Losing Nails?

If your dog has been losing nails, or you’ve noticed several claws cracking, splitting, and falling off across more than one paw, it’s understandably alarming. The condition most likely behind this is symmetric lupoid onychodystrophy, or SLO, an immune-mediated disease where the body’s own defenses mistakenly attack the tissue at the base of each claw.

It’s a lot to take in, but here’s the honest truth: SLO is usually manageable with the right treatment plan, even if it doesn’t go away completely.

What is symmetric lupoid onychodystrophy in dogs?

SLO is an immune-mediated claw disease, meaning it’s not caused by a fungal infection or physical injury, but by the immune system malfunctioning and attacking the nail tissue. The word “symmetric” refers to the pattern: SLO typically affects nails on multiple paws, often in a roughly mirrored pattern rather than just one isolated claw.

The result is a cycle of nails detaching and falling off, brittle and splitting nails, and misshapen regrowth. It can happen quickly or progress gradually over weeks. Either way, it’s painful for your dog.

SLO isn’t fatal on its own. But left untreated, it can lead to chronic pain, persistent secondary infections, and a significantly lower quality of life.

What are the symptoms of lupoid onychodystrophy?

The signs of SLO are usually hard to miss once multiple nails are affected. Here’s what you might notice at home:

• Nails falling off or pulling away from the paw, often starting with one or two before spreading
• Nails that look cracked, brittle, or split at the tip or along the side
• Regrown nails that come back misshapen, soft, or oddly colored
• Bleeding or raw nail beds after a nail detaches
• Your dog licking or chewing at their paws more than usual
• Limping or reluctance to walk on hard surfaces
• Swelling, redness, or discharge around the nail beds, which are signs of a secondary bacterial infection

One thing vets look for that’s worth knowing: SLO almost always affects more than one nail, across more than one paw, usually within weeks of the first nail being lost. If it’s just one nail that broke or fell off, there’s often a different, more mechanical explanation. Multiple nails across multiple paws points more strongly toward SLO.

What triggers SLO in dogs?

The honest answer is that researchers still don’t have a definitive cause. What’s clear is that SLO is immune-mediated, meaning something prompts the immune system to treat the nail matrix as a threat and attack it. A few factors seem to be involved:

• Genetics and breed predisposition: Some breeds are significantly more prone to SLO than others. German Shepherds, Gordon Setters, Rottweilers, and Labrador Retrievers appear on the higher-risk list. If your dog is one of these breeds, SLO is worth knowing about.
• Possible food or environmental triggers: Some vets suspect that underlying food allergies or environmental sensitivities may play a role in triggering or worsening the immune response, though this isn’t proven definitively.
• Age: SLO most often appears in middle-aged to older dogs, though younger dogs can develop it too.

Because the root cause isn’t fully understood, treatment focuses on calming the immune response rather than eliminating a specific trigger.

How do vets diagnose lupoid onychodystrophy?

There’s no single blood test that confirms SLO. Diagnosis is mostly clinical, meaning your vet will look at the pattern of nail loss, the breed, the dog’s age, and rule out other causes like fungal infection, bacterial infection, or trauma.

In some cases, a biopsy is performed, where the vet takes a small tissue sample from the nail bed and sends it to a lab to examine under a microscope. A biopsy can help confirm the diagnosis and rule out other claw diseases, especially when the presentation is unusual or the dog isn’t responding to initial treatment.

Your vet may also recommend skin or allergy testing if they suspect an underlying trigger.

Lupoid onychodystrophy treatment options

SLO can’t be cured, but many dogs do very well on a long-term management plan. Treatment is usually a combination of supplements and medications, and your vet will often start with the gentlest options first.

Supplements

High-dose omega-3 fatty acids, found in fish oil, and vitamin E are almost always the first line of treatment. These have anti-inflammatory properties that help calm the immune overreaction. They’re not a quick fix. It can take two to three months to see noticeable improvement, but they’re well-tolerated and form the backbone of most SLO treatment plans.

Immunomodulating medications

If supplements alone aren’t enough, your vet may recommend medications that dial back the immune response. Two commonly used options are:

• Tetracycline and niacinamide: An antibiotic paired with a B-vitamin derivative that work together to help regulate the immune system without being full immunosuppressants.
• Pentoxifylline: A medication that improves blood flow and reduces inflammation. It’s often used alongside or instead of the tetracycline-niacinamide combination, depending on how your dog responds.

Treating secondary infections

When nails fall off and leave raw nail beds exposed, bacteria can move in quickly. Secondary infection is common with SLO, and your vet may prescribe antibiotics to address it. Keeping the paws clean at home is just as important as the prescription here.

At-home paw care during SLO recovery

The medical treatment your vet prescribes is only part of the picture. What you do at home between appointments makes a real difference in your dog’s comfort and recovery.

Keep remaining nails trimmed short

Long nails catch on surfaces, create leverage, and can tear at already-fragile nail beds. Regular, gentle trimming of the nails that are still intact reduces the risk of further trauma. Ask your vet to show you the right length to aim for given your dog’s current nail condition.

Protect sore paws on hard surfaces

Soft booties or paw wraps can give your dog’s feet some cushioning while nail beds are raw and healing. Not every dog tolerates them, but even using them for outdoor walks while skipping them inside can reduce daily irritation. Avoid rough pavement or gravel during active flare-ups when possible.

Keep nail beds clean and dry

After outdoor walks, gently rinse your dog’s paws and pat them dry. Moisture trapped around exposed nail beds creates a perfect environment for bacterial growth. Your vet may recommend a diluted antiseptic soak. Follow their guidance on frequency and what to use.

Stay on top of the supplement schedule

The omega-3 and vitamin E regimen only works if it’s consistent. Set a daily reminder, keep the supplements somewhere visible, and don’t skip doses even when your dog seems to be improving. SLO management is a long game, and consistency is what makes the difference.

Know the early signs of secondary infection

Check your dog’s nail beds regularly, ideally every day or two during active flare-ups. Redness spreading beyond the nail bed, swelling, a bad smell, yellow or green discharge, or your dog pulling away sharply when you touch a paw are all reasons to call your vet sooner rather than later.

Does pet insurance cover SLO in dogs?

Yes, SLO is eligible for coverage under a Lemonade Pet accident and illness policy, as long as the condition isn’t pre-existing. That means your dog shouldn’t be showing any signs or symptoms before your policy starts or during your waiting period.

SLO is a long-term condition, which means ongoing costs. Prescription medications like tetracycline, niacinamide, and pentoxifylline, as well as treatment for secondary infections, can be covered under the base policy. Vet exam and visit fees aren’t included in the base policy but can be added with the Visit Fee add-on. It’s also worth knowing that supplements like omega-3 fish oil and vitamin E, while an important part of SLO management, aren’t covered under any current Lemonade Pet plan. Over months and years, the costs that are covered can still add up to meaningful savings. Getting coverage in place while your dog is healthy is what makes it actually useful when you need it.

Before we go

SLO is one of those conditions that sticks around and requires ongoing attention. But with the right treatment plan and consistent home care, most dogs manage well and stay comfortable. Stay on top of the supplement schedule, keep those paws clean and protected, and check in with your vet at the first sign of a flare. And if your dog isn’t already covered, now is a good time to look into it while they’re still healthy.

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.