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Pictures of Dog Tumors, Cysts, or Warts [by a Veterinarian]

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Weight: Pounds

dog leg lump treatment at the vet

This article was updated on May 14th, 2023

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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.

Dog with two veterinarians

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 tumor. Always consult with our local veterinarian to confirm the diagnosis and determine the best treatment plan for your old dog.

1. Lipomas

Lipomas are fatty tumors. Non-cancerous. Painless. Soft and moveable.

potential lipoma on a dog

View more Lipoma pictures.

2. Sebaceous Cysts

Fluid-filled sac. Non-cancerous. Pink and hairless. Shiny and oily. As shown on the two images below.

View more pictures of sebaceous cysts, and more pictures of different types of cysts in dogs.

WATCH: 3 Important Tips To Care For an Old Dog [VET VIDEO]

3. Mast Cell Tumors

Cancerous or benign. White or pink.  

View more mast cell tumor pictures.

4. 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.

View more pictures of mammary gland tumors

5. Melanoma

Cancerous or benign. Black. Raised or flat. Here is a picture of a melanoma in a dog’s mouth (black growth):

melanoma in dog's mouth

6. 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.  

Squamous Cell Carcinoma:

7. Soft Tissue Sarcoma

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

sarcoma on a dog

8. Anal Gland Tumour (Adenocarcinoma)

Usually cancerous. Growth on or just next to the dog’s anus. Firm. Can be ulcerated/infected.

anal gland tumor

9. Warts

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

wart on a black dog

View more examples and pictures of warts or find out how to remove dog warts.

Disclaimer: This content is not a substitute for veterinary care. Always consult with your vet for health decisions. Learn more.

Learn more:

Overview graphic:

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

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


  • Dr Alex Crow, Veterinary Surgeon

    Alex Crow, VetMed MRCVS, is an RCVS accredited Veterinary surgeon with special interests in neurology and soft tissue surgery. Dr Crow is currently practicing at Buttercross Veterinary Center in England. He earned his degree in veterinary medicine in 2019 from the Royal Veterinary College (one of the top 3 vet schools in the world) and has more than three years of experience practicing as a small animal veterinarian (dogs and cats).


  1. My dog has developed about a dozen tiny lumps virtually over night. She also seemed to be under the weather. Does anyone have an idea?

  2. I have a 9 year old English pointer. A year ago she started getting knots under her belly
    . Over the year she has seen many vets. Now one know has gotten so big its draining all the time. They tried to do surgery because of her heart we about lost her the min they put her to sleep. They have tried 17 different medicines. They say it’s cancer and there’s nothing else that can be done. We are spending about $600.00 every 2 weeks on her. I just don’t know what to do!!!

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