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Pictures of Dog Tumors, Cysts, or Warts: How to Diagnose a New Lump

Score for Seniors:
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Weight: Pounds

lumps and bumps header images

You will find below a list of pictures of lumps and bumps that are often observed on older dogs as they get into their senior years. Please note that the pictures are provided as examples only. It usually is not possible to determine the real nature of a dog lump, wart, cyst or tumor by just looking at it.

Important: As veterinarians, we can never say what a dog lump is without testing it, for example by taking biopsies. For example, we have seen what looks like a lipoma actually come back as a malignant mast cell tumour. Always consult with our local veterinarian to confirm diagnosis and determine the best treatment plan for your old dog.

Lipomas: Fatty tumors. Non-cancerous. Painless. Soft and moveable.

lipoma on a dog

Sebaceous Cysts:
Fluid-filled sac. Non-cancerous. Pink and hairless. Shiny and oily.

Mast Cell Tumors:
Cancerous or benign.
White or pink.  

Mast cell tumor

Mammary Gland Tumors:
Cancerous or benign. Often next to or within the nipple. May extend between multiple mammary glands. Firm. May have ulcerated skin overlaying, or be abscessated/bleeding.  

mammary gland tumor on a dog

Melanoma:
Cancerous or benign. Black. Raised or flat.  

Squamous Cell Carcinoma:
Cancerous. Raised and red. Usually a single tumour but can present as multiple masses. Often found in light-skinned areas or in the mouth. May become ulcerated or bleed.  

Soft Tissue Sarcoma:
Cancerous. Many different types, depending on the tissue affected (including fibrosarcoma, haemangiosarcoma, liposarcoma). Soft or firm. Often invasive into surrounding tissue.

Anal Gland Tumour (Adenocarcinoma):
Usually cancerous. Growth on or just next to the dog’s anus. Firm. Can be ulcerated/infected.

This image has an empty alt attribute; its file name is Anal-gland-tumour.jpg

Warts:
Single or cluster of tiny lumps. Most often benign. Can disappear after a few months. Occasionally cancerous.

wart on a black dog

Overview graphic:

Overview graphic of common lumps, tumors, cysts and warts on dogs

Important disclaimer:
Images are provided as examples only. It usually is not possible to determine the real nature of a bump, lump, wart, cyst or tumor by just looking at it. Always consult with our local veterinarian to confirm diagnosis and determine the best treatment plan. Your veterinarian is likely to perform testing which could include a biopsy.

Go to our page on Lumps, Bumps, Tumors, Cysts, and Warts for more information.

Still have questions?
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Author

  • Alex Crow is an RCVS accredited Veterinary surgeon with special interests in neurology and soft tissue surgery. Dr Crow is currently practicing at Buttercross Veterinary Center. He earned his degree in veterinary medicine from the Royal Veterinary College (one of the top 3 vet schools in the world).

Disclaimer: This website's content is not meant to be a substitute for veterinary care, diagnosis, or treatment. Always consult with your veterinarian to determine the best course of action. Read More.

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