Does Your Dog Have Vasculitis?

If your dog has crusty, raw, or ulcerated skin on their ear tips, paw pads, lips, or tail tip, and your vet has mentioned vasculitis, here’s what that means: the blood vessels in the skin are inflamed, which prevents them from delivering oxygen and nutrients properly, and the surrounding tissue breaks down. Vasculitis usually isn’t a disease on its own. It’s a sign that something else is going on, whether that’s a drug reaction, a vaccine, an infection, or the immune system misfiring.

Finding that underlying trigger is the most important part of treatment.

What does vasculitis look like in dogs?

The signs of canine vasculitis tend to show up at the body’s extremities, the places where blood flow is most vulnerable. Here’s what you might notice:

• Crusty, scabbed, or ulcerated ear tips: The edges of the ears may look like they’re eroding or curling inward. When vasculitis is specific to the ear flap, vets call it pinnal vasculitis.
• Sores or ulcers on paw pads: These don’t heal the way a normal scrape would and may keep reopening.
• Skin sores on the lips, nose, tail tip, or mouth: Often slow to heal and prone to crusting.
• Purple or red patches on the skin: These look like bruising but are actually caused by blood leaking from damaged vessels. Vets call this purpura.
• Swelling around affected areas: The skin may look puffy or feel firm.
• Pain or sensitivity when touched: Your dog may flinch or pull away when you touch the affected area.
• Hair loss over affected patches: The skin underneath may look raw or discolored.

Pinnal vasculitis, the ear-tip form, is one of the more common presentations in dogs and can look alarming. The tips of the ears may appear notched, raw, or like they’re being eaten away at the edges. It’s not an emergency in the way a broken bone is, but it does need veterinary attention soon.

What causes vasculitis in dogs?

Vasculitis happens when the immune system attacks the walls of blood vessels, either directly or as collateral damage while fighting something else. Common triggers include:

• Drug reactions: Some medications can trigger an immune response that targets blood vessels
• Vaccine reactions: A known but uncommon trigger, particularly associated with rabies vaccines in some dogs
• Infections: Bacterial, viral, fungal, or tick-borne infections can all set off the process
• Immune-mediated disease: Conditions where the immune system attacks the body’s own tissues
• Cancer: Tumors can sometimes trigger vasculitis as a secondary effect
• Idiopathic vasculitis: Meaning no identifiable cause is found, even after a thorough workup

Because the trigger matters so much for treatment, your vet will spend time investigating before landing on a diagnosis.

How do vets diagnose vasculitis?

Your vet will likely recommend a skin biopsy: a procedure where a small sample of affected skin is removed under local anesthesia and sent to a pathologist. The biopsy confirms that vasculitis is actually what’s happening (and not something that just looks like it), and can sometimes give clues about the type and cause.

Beyond the biopsy, your vet will probably run bloodwork and urinalysis to look for infections, organ involvement, or immune-mediated disease. They may also ask you a detailed history about recent medications, vaccines, illnesses, and diet changes, because that timeline is often the key to finding the trigger.

Your trigger-hunt guide: a simple home log to help your vet

Before your vet appointment, or while you’re waiting for biopsy results, start a simple log covering the 8 to 12 weeks before symptoms appeared. Your vet is looking for a trigger, and a timeline you’ve built at home can cut the investigation time significantly.

What to track	What to note
Medications	Any new prescriptions, over-the-counter treatments, flea and tick preventives, or supplements. Note the start date and dose.
Vaccines	Date, type, and which clinic administered them. The rabies vaccine in particular is worth flagging.
Illnesses or infections	Any recent stomach bugs, respiratory symptoms, skin infections, or tick bites, even if they seemed minor at the time.
Diet changes	New food, treats, chews, or anything introduced around the time signs started.
When symptoms first appeared	Which body part was affected first, and how things progressed from there.

At-home care for ear tips and paw pads while you wait

Vasculitis-affected skin is fragile. Until you have a treatment plan in place, here’s how to protect it. Always confirm specifics with your vet before applying anything.

• Keep ear tips clean and dry. If ear tips are raw, try to prevent vigorous head shaking, which can worsen tissue damage.
• Protect sore paw pads. Limit walks on rough or hot surfaces. Soft booties can cushion the area and reduce further irritation.
• Avoid human antiseptics. Products like hydrogen peroxide can damage already-compromised skin. Ask your vet what’s safe to use.
• Use an e-collar. Licking slows healing and introduces bacteria. Keep the cone on when you can’t directly supervise your dog.
• Check affected areas daily. Note any changes in size, color, or discharge and report them to your vet at your next appointment.

How is canine vasculitis treated?

Treatment depends on what’s driving the vasculitis. If a drug or vaccine reaction is identified, stopping the trigger is the first step. From there, your vet may recommend:

• Corticosteroids (like prednisone): Anti-inflammatory medications that help calm the immune response attacking the blood vessels
• Immunosuppressants: Stronger medications that dial back immune activity when corticosteroids alone aren’t enough
• Pentoxifylline: A medication that improves blood flow to small vessels and is often used specifically for cutaneous vasculitis in dogs; it works differently than immunosuppressants and is sometimes used alongside them
• Antibiotics: If a bacterial infection is identified as the trigger
• Wound care: Keeping sores clean, protected, and monitored as they heal

For idiopathic cases, where no trigger is ever found, management is often long-term. Some dogs need ongoing medication to keep symptoms under control. The prognosis for vasculitis in dogs varies widely depending on the cause: cases tied to a drug or vaccine reaction often resolve once the trigger is removed, while immune-mediated or idiopathic cases may require lifetime management.

Does pet insurance cover vasculitis in dogs?

Yes, vasculitis 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.

Biopsies, diagnostic workups, and long-term medications like pentoxifylline or immunosuppressants add up, especially for cases that require ongoing management. Getting coverage in place before symptoms appear is what makes it actually useful when you need it. 

Before we go

Watching your dog deal with painful, slow-healing skin is hard. The good news is that once the trigger is identified, treatment can make a real difference. Keep your home log updated, stay on top of wound care between appointments, and don’t wait on a vet visit if the sores are spreading or getting worse. Your dog is lucky to have someone paying this close attention.

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.