Why can appeared Bump on a Dog’s Tail?


The should not be any morbid growths in a healthy animal. The causes for the development of those may be both natural and pathological. Dog tend to develop lumps on their tails.

Types of Emerods

The swellings are divided into two large groups: cancerous and non-cancerous. Possible causes: traumatic injuries, insect bites, infectious diseases, tumor growth.

Non- Cancerous Growths

The causes for non-cancerous swellings on the dog’s tail are:

  • blockade of sebaceous follicles, their subsequent inflammation;
  • injury;
  • surgical misadventure, vascular damage;
  • solution of continuity of the skin;
  • diseases of infectious nature.

Lumps more often appear under the skin. In this case, they are visible. If the morbid growth develops in deeper layers, it can only be detected by palpation.

Warts and Papillomas

They do not cause pain or itching. Most often, these growths are not dangerous until they begin to grow considerably in size and change color. The reason for these changes is in the weakening of the barrier functions, which is often observed in old, young or sick animals as well as in in the post-surgery period.


A blister filled with pus may appear due to pathogenic bacterium flora growth. It usually gets embedded in the places of bites, wounds and other skin lesions. A firm lump at the base of a dog’s tail usually results from an inflammatory reaction in the perianal hepatoid glands. As the infectious onset spreads, the swelling is formed.

Fatty Tumours

Lipoma can be a single occasion or amount to a group of lumps under the skin or in close tissue layers. Its small sizes do not cause discomfort. The causes are not fully known.


Those look like white bumps on the dog’s tail. The causing factor is a compression or complete blockage of the ducts of the sebaceous or sweat glands. Typical indications of a cyst under the skin: small size, round shape, tender to the touch, soft, slightly quaggy consistency.


Such swelling appears due to accumulation of excess liquid under the skin after a damage to the vessel during surgery. If the vessel is a large one, and the gap is extensive, the lump will be large. A soft lump with purulent fluids on the tail of a dog causes severe discomfort and pain, therefore, requires surgical measures.

Insect Bites

Bumps are formed as an indicator of an allergic reaction. They are thick, medium sized, pinkish, and tender. They cause considerable itching, so the dog may claw at the irritated area.

Cancer Tumors

Those are usually well-hidden under the coat of an animal, so you should regularly inspect the pet. They are formed of mutated and overgrown cells that cause changes in the tissues. Tumors can be benign and malignant. In the first phase they grow slowly. Their causes are not yet fully understood. In later stages they often grow very quickly, spreading to nearby organs and tissues. Dog’s tail may develop skin cancer that looks like small redensifications.


In case of pathological factors, there is fever heat, the dog becomes sedentary, lethargic, refuses food. Pain is manifested by whining, barking, and sometimes with aggressive behavior. The location of the growth can be warm to touch. Lymph glands are often enlarged in this case. If the bump is caused by an insect bite, the dog may scratch this place until the wound opens. Benign tumors do not cause discomfort in the pet, so there are no specific symptoms. If the tumor is cancerous, the redensifications may rupture and bleed. The dog experiences severe pain, especially when in metastasis.

Photo of Bumps on a Dogs’ Tail

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If a lump is suspected under the dog’s skin, carefully examine and palpate it. If the touch causes pain or if bleeding or festering is revealed, immediately take the pet to the veterinary. He will prescribe a set of tests to determine the nature of the morbid growth: x-rays; tomography; biological material taking; smear; radiography. The treatment is prescribed only after the diagnosis is confirmed. It may be conservative or operational treatment. Benign lesions are treated in two ways: surgical removal or growth monitoring. If the tumor does not grow, no need in surgical measures. Cancers are removed by the following methods:

  • surgical resection;
  • chemotherapy;
  • irradiation.

After these procedures, the pet requires a recovery period, regular observation and immunotherapy. For abscesses, there are two approaches: incision and drainage of an abscess under general supervision; administration of antibacterial medications. Fatty Tumours are removed surgically. They rarely become malignant. Treatment of papillomas and warts: incision or freezing with liquid nitrogen; novocaine injections; natural home remedies (cautery with iodine, garlic or celandine juice).

Bumps at the base of a tail in a dog rarely appear. To identify them in timely you should carefully observe and inspect the pet.

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