What are the common symptoms of systemic vasculitis in dogs and cats?

Common signs include reduced alertness and activity, loss of appetite, recurring fever, and skin changes such as redness, pain, or swelling. A veterinary examination is needed to confirm the diagnosis.

How does a vet typically test for vasculitis?

The vet will start with blood work, a biochemistry panel, and urinalysis. If needed, a skin or tissue biopsy may be performed alongside imaging studies to rule out other causes. Follow your vet's guidance on which tests are appropriate.

Can systemic vasculitis spread to other pets?

Most cases of vasculitis are caused by immune-mediated or other non-infectious factors and are not contagious. However, the risk depends on the underlying cause — discuss this with your vet, who may recommend isolation or further testing.

How long is follow-up care needed after symptoms are detected?

The duration of treatment and follow-up varies depending on the underlying cause and severity, typically ranging from several weeks to several months. Regular check-ups and blood tests are required throughout — follow your vet's schedule.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Systemic Vasculitis in Dogs & Cats: Symptoms, Blood Tests & Care Guide [2025]

The immune system attacks blood vessels throughout the body, causing multi-organ damage. Certain breeds have a genetic predisposition, and long-term immunosuppressive therapy is often required.

Take 1 minute to check the symptoms first

Last updated: 2025/12/16

Pethealthmap Editorial Team

Sources: ACVIM, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Immediate Emergency Care

•Rapid breathing or obvious respiratory distress that does not improve
•Sudden fainting or loss of consciousness and unable to be roused
•Widespread skin bleeding or severe swelling that is rapidly expanding

Schedule a Clinic Visit Soon (within 24–72 hours)

•Persistent high fever or unstable body temperature lasting more than 48 hours
•Noticeably reduced appetite with ongoing weight loss
•Localized skin pain or recurring edema that is not improving

01What symptoms indicate something is wrong?

Systemic vasculitis in dogs and cats often presents as non-specific, whole-body symptoms that may affect the skin, body temperature, and energy levels. Early signs commonly include changes in alertness and appetite; be more vigilant if localised pain or swelling also appears.

Altered mental status or noticeably reduced activity
Loss of appetite and gradual weight loss
Recurring fever or unstable body temperature
Localised or widespread swelling, skin redness, or pain
Pain response or avoidance behaviour when touched
Tip: If any of these changes appear, schedule a clinic visit promptly

Seek emergency care immediately if you notice the following symptoms:

⚠️ Difficulty breathing or noticeably worsening laboured breathing
⚠️ Sudden collapse or loss of consciousness
⚠️ Widespread skin haemorrhage or severe swelling

02How do I assess my pet at home? Key observations and emergency criteria

Carefully monitoring and recording symptoms at home helps your vet quickly understand how the condition is progressing and arrange appropriate tests.

Track changes in alertness and daily activity levels
Measure body temperature daily and log the reading and time
Weigh your pet regularly and note any weight trends
Record food intake and note any vomiting or diarrhoea with timestamps
Photograph or video any skin changes, swelling, or painful areas
If abnormalities arise, arrange a specialist or clinic visit as soon as possible

03How will the vet make a diagnosis? Common diagnostic tests

At the clinic, your vet will combine blood work, imaging, and pathology to rule out infection, assess organ involvement, and confirm vascular disease.

Complete blood count (CBC) to assess inflammation or bleeding tendencies

Blood biochemistry panel to evaluate liver, kidney, and other organ function

Urinalysis to check for kidney and urinary tract abnormalities

Skin or affected tissue biopsy (histopathology) to confirm vascular lesions

Bacterial culture to rule out or identify an infectious source

Advanced imaging such as CT or MRI when needed to evaluate deep lesions

04How is the condition treated and managed? Medications, diet, and home care

Treatment typically combines targeted medications and supportive care, along with regular blood work and clinical monitoring to evaluate effectiveness and side effects.

Anti-infective or immunomodulatory medications may be prescribed based on your vet's assessment
Hospitalisation, fluid therapy, or oxygen support may be needed in severe cases
Regular blood and urine tests to monitor disease progression
Medication adjustments and scheduled follow-up visits based on clinical response
Dietary management and weight control as supportive care
Long-term follow-up at a hospital with specialist capabilities is recommended

05What should I prepare before the vet visit? Key information to speed up diagnosis

Note when symptoms started and how they have progressed (including any sudden worsening)

Prepare a daily log of food intake, bowel movements, and temperature readings

List all current and recent medications, vaccines, and supplements

Bring photos or videos of any skin changes, swelling, or unusual behaviour

If a biopsy or CT scan may be required, contact a hospital equipped for those tests in advance

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.