Moles or Growths on Dogs

by Michelle A. Rivera Google
    As your dog ages, he may develop small growths or moles.

    As your dog ages, he may develop small growths or moles.

    Goodshoot/Goodshoot/Getty Images

    If while grooming your dog you find some weird kinds of lumps or bumps, you may be tempted to diagnose them yourself and even try to remove them. Some moles and growths on a dog's skin is quite normal, others are cause for concern. It's important to know the difference. Get your dog to the vet if you have any doubt.

    Skin Tags

    Skin tags are common on dogs; they increase in number as dogs age.They look a little bit like warts but are more flexible and often longer and narrower. It's not clear why they appear, but it's likely their development has something to do with allergy sensitivities or genetics, just as some people are more prone to moles. Skin tags are usually benign and do not need attention unless they become inflamed or infected. Damage to a skin tag could result in infection, though, so if your dog scratches his skin tags or if they appear on his tail or another body part where they are likely to be bumped, have him checked out by your vet, who may recommend removal.


    Moles on dogs are common, especially on dogs with darker pigment in their skin. The scientific name for moles on dogs is sebaceous adenomas. They can appear anywhere on the body, much like skin tags. They differ from skin tags in structure and texture. Skin tags tend to be small and floppy, but moles are flatter and harder. To find them, rub your hands along your dog's body under the fur where you will be able to feel and see them easily. Exposure to the sun can make your dog more prone to moles. They are slow-growing and are usually benign. Watch for any changes in shape, size or texture of the mole.

    Cancerous Growths

    Since most skin tags and moles are benign, or noncancerous, they're usually nothing to worry about. But if you do see changes in size, texture or shape of a mole or growth, you need to take your dog to the vet for a definitive diagnosis and treatment options. Just as melanoma is one of the most deadliest cancers in humans, it's dangerous to allow it to go untreated in dogs. According to Dr. Wendy Lavalle, a South Florida veterinarian specializing in canine and feline cancer, the majority of cutaneous, or "of the skin," growths and subcutaneous "under the skin" growths in dogs are benign. However, the incidence of malignant tumors increases with age and is twice as likely with purebred dogs than with mixes. She stresses that early treatment is key to a good prognosis.

    Malignant Tumors

    Dr. Lavalle says the aggression of malignant tumors varies. "Some are locally invasive and can become ulcerated and infected. Other malignant tumors are more aggressive and can metastasize (spread to distant locations such as lungs, lymph nodes and other organs) and become locally destructive." So early intervention is critical to your dog's prognosis. Mast cell tumors are the most common skin tumor in dogs; they range from benign to highly malignant. These tumors can have a varied appearance, but one thing they have in common is the ability to grow larger and suddenly decrease in size. Dr. Lavalle explains that the sudden changes are a result of "the release of histamine -- a chemical released during allergic reactions -- which is why your skin becomes swollen and red after an ant bite or bee sting."

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    About the Author

    Michelle A. Rivera is the author of many books and articles. She attended the University of Missouri Animal Cruelty School and is certified with the Florida Animal Control Association. She is the executive director of her own nonprofit, Animals 101, Inc. Rivera is an animal-assisted therapist, humane educator, former shelter manager, rescue volunteer coordinator, dog trainer and veterinary technician.

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