Skip to content
Peqaboo
Open Peqaboo
Explore Peqaboo

Open Peqaboo
Choose your language

EnglishUnited States

HealthDog4 min read

Understanding Cancer Risks in Your Bullmastiff

This guide helps you monitor your Bullmastiff for early signs of health changes. By performing consistent home exams, you can identify potential issues early and provide your veterinarian with the clear information needed for an accurate diagnosis.

Quick answer

Bullmastiffs are a breed that requires vigilant monitoring for specific health concerns. The most significant condition to be aware of is the Mast Cell Tumor. This is a recognised tendency in the breed rather than a proven one. Because early detection is the most effective way to manage health outcomes, maintaining a consistent routine of physical checks at home is essential for your dog's long-term well-being.

Mast Cell Tumors

Mast Cell Tumors are a form of skin cancer that can appear in various locations on a dog's body. This is a recognised tendency in the breed. These growths originate from mast cells, which are a normal part of the immune system, but in this case, they multiply uncontrollably.

What you will notice at home

Owners often first notice a small lump or bump on the skin. These tumors can be deceptive. They may appear as a small, hairless patch, a red or irritated area, or even a firm mass that seems to change size or appearance from day to day. Sometimes, the area may become swollen or inflamed, especially if the dog scratches or licks at the spot. Because these tumors can mimic other common skin issues like bug bites or minor cysts, it is easy to dismiss them initially. However, any new or changing mass on your dog's skin should be treated as a priority for investigation.

What the vet does

When you bring your dog in for a suspected mass, the veterinarian will perform a physical exam to assess the size, location, and firmness of the growth. The gold standard for diagnosis is a fine needle aspirate, where a small sample of cells is drawn from the mass with a needle and examined under a microscope. If the aspirate is inconclusive, the vet may recommend a surgical biopsy to get a definitive diagnosis. This test is crucial because it allows the pathologist to determine the grade of the tumor, which tells the vet how aggressive it is likely to be.

Urgency and action

Do not wait to see if a lump disappears on its own. The mistake many owners make is waiting for the mass to change or grow before seeking help. Early detection allows for a much wider range of treatment options. If you find a new lump, schedule an appointment within a few days. If the lump appears to be growing rapidly or if the skin over it becomes ulcerated or bleeds, treat this as an urgent matter.

Checklist0/3
What should I do if I find a lump?
Do not panic, but do not ignore it. Take a photo of the lump for reference and note its size and location in a logbook. Call your vet to book an appointment for an examination and a potential fine needle aspirate.
Can I tell if a lump is cancer just by looking at it?
No. Many skin conditions look identical to Mast Cell Tumors. Only a microscopic analysis of the cells by a professional can confirm what the growth is.
How often should I check my dog?
For a healthy adult Bullmastiff, a thorough hands-on check once a month is sufficient. If your dog is a senior, increase this frequency to once a week to catch any changes as early as possible.

My highlights & notes

This article is for general education and is not a substitute for professional veterinary advice. If your pet is unwell, please consult a veterinarian.

Worried about your pet?

Peqaboo’s AI helps you track symptoms, understand lab reports, and know when to see a vet.

Get the Peqaboo app