Mass Removals & Biopsies for Cats and Dogs

Finding a lump or bump on your pet can be concerning. While many masses in dogs and cats are benign, others may be cancerous or require treatment to prevent discomfort or complications. At Whittington Veterinary Clinic, we provide thorough evaluation, surgical removal, and diagnostic testing for skin masses, growths, and tumors in both cats and dogs.

Common Causes of Lumps and Masses in Pets

Not all masses are cancerous—some are completely harmless. However, a proper veterinary assessment is the only way to know for sure. Common causes include:

  • Lipomas – Benign fatty tumors common in older animals
  • Sebaceous cysts – Blocked oil glands that form small, fluid-filled lumps
  • Abscesses – Pockets of infection often caused by bites or puncture wounds
  • Warts or skin tags – Often harmless but may become irritated or infected
  • Mast cell tumors – Potentially cancerous tumors requiring removal and testing
  • Soft tissue sarcomas – Firm, often slow-growing tumors that may spread locally
  • Mammary tumors – Especially common in unspayed female pets
  • Infected or inflamed glands – Such as anal gland abscesses or enlargement

Evaluation and Diagnosis

If we find a lump during an exam or if you bring one to our attention, we’ll begin with:

  • Physical examination – Assessing size, shape, location, and mobility
  • Fine needle aspiration (FNA) – Collecting cells from the mass for microscopic evaluation
  • Surgical biopsy or removal – Often recommended for deeper or suspicious growths
  • Lab submission (histopathology) – Determines whether the mass is benign or malignant and guides future care

Treatment: What to Expect

If removal is needed, we’ll perform surgery under general anesthesia. We carefully excise the mass and surrounding tissue if necessary, especially if cancer is suspected. The tissue is then submitted to a diagnostic lab for confirmation of the type and behavior of the mass.

Post-operative care typically includes:

  • Pain medication
  • Antibiotics (if infection risk is present)
  • Activity restriction
  • E-collar use to prevent licking or chewing
  • Follow-up appointments to monitor healing
  • For malignant tumors, further treatment may include additional surgery, imaging, or referral for oncology care if appropriate

When to Call Us

Contact us if you notice:

  • A new lump or bump
  • A mass that is growing, changing shape, or bleeding
  • Signs of discomfort, pain, or licking at the area
  • A mass in a high-risk location, such as the mammary glands, mouth, or rectum

Concerned About a Lump on Your Pet?

Early evaluation and treatment are key. Call Whittington Veterinary Clinic at (337) 893-8522 to schedule an exam—we’re here to provide answers and care you can trust.