Hemangiosarcoma is a high-severity cancer condition that can affect dogs of all ages and breeds. Hemangiosarcoma is an aggressive malignant tumour of blood vessel cells. It most commonly affects the spleen, heart, and liver. Splenic rupture causing life-threatening internal haemorrhage is often the first sign. Prognosis is poor even with treatment. It is documented across 5 breeds, though prevalence and severity can differ significantly between them. It typically becomes apparent at 8-13 years. Early signs to watch for include sudden collapse, pale gums, abdominal distension, and weakness. When treatment is required, costs are estimated at £4,000-£10,000 depending on severity, location, and the specific intervention needed. This page covers symptoms, treatment options, and preventive steps — along with breed-specific information where available.

Signs & Symptoms

The following symptoms are commonly associated with Hemangiosarcoma in dogs. If your dog displays several of these signs, consult your vet promptly — early diagnosis typically leads to better outcomes.

• Sudden collapse
• Pale gums
• Abdominal distension
• Weakness
• Rapid breathing
• Sudden death

Treatment Overview

Emergency splenectomy followed by chemotherapy (doxorubicin-based) is standard. Median survival with surgery alone is 1-2 months; with chemotherapy, 4-6 months. Immunotherapy is being investigated.

Typical onset: 8-13 years

Prevention & Screening

While not all cases of Hemangiosarcoma can be prevented, the following steps reduce risk or enable earlier intervention:

• No proven prevention
• Routine abdominal ultrasound in high-risk breeds from age 5

Breeds Affected by Hemangiosarcoma

The following 5 breeds are documented as being susceptible to Hemangiosarcoma. Click any breed to view breed-specific information about this condition, including prevalence and recommended screening.

• German Shepherd (large)
• Golden Retriever (large)
• Labrador Retriever (large)
• Boxer (large)
• Sloughi (large)