Lump on a Dog’s Body Side: Causes and Treatment


If a dog has a lump on its side, then it is necessary to exclude a huge variety of possible pathologies, starting from eosinophilic granulomas and ending with a malignant malignant mastocytoma. The age of the animal is of great importance (malignant tumors are most of all diagnosed after the age of 7 years) and the breed (in decorative breeds, constant problems with allergic reactions).

The master must understand that any seal on the skin or under it in his pet can be life-threatening. Therefore, in no case we ignore even small balls, which, at first glance, seem to be quite harmless.

List of Possible Causes

If you look at the statistics, then the sides most often suffer from allergies or the growth of neoplasms (benign or malignant). But, there are other, no less dangerous reasons.


Even a small blow can cause a bump on the body side of the dog. In smooth-haired breeds, it will be visible (the color is mainly dark blue, black). If the undercoat is large, then the hematoma can only be felt.

Most of them go away within 3-7 days. In some cases, the hematoma needs to be opened and cleaned. A lot attention is paid to accompanying symptoms (expression, rapid increase in size, pain when touching). Such symptoms are typical for injuries sustained after an accident or a fall from a great height.

Eosinophilic Granuloma

Recently, it is more and more common. This is due to the result of multiple mutations in some breeds. It is considered an autoimmune disease, the activity of which can be triggered by improper diet or medication. Pea-sized bumps appear on the dog’s skin. Solid to the touch.

Localization of formations: chin, brow ridges, body sides, paws, abdomen. It can also manifest as sores in the mouth and lips. To make a diagnosis, it is imperative to study the cells taken from the education, since confirmation of the good quality of the process is needed. But, if the root cause that causes the appearance of granulomas is not eliminated, treatment can be long and there is a high risk of relapse.


It is considered a benign formation (according to statistics, less than 10% of papillomas are transformed into cancer), which is removed only as a last resort. This is more of an aesthetic problem. Removal is resorted to when the papilloma interferes with the full life of the animal or is actively growing.

It can appear in any part of the body, so a bump on the side of a dog may well turn out to be a large papilloma. There are also breeds that, from childhood, are “rewarded” by nature with a large number of these formations. In French and English Bulldogs, they are most often found on the face and legs.

There are many cases when papilloma regressed on its own without any external influences on it. Also, their appearance is closely associated with hormonal changes (in females during estrus, several neoplasms can grow at once).

The removal method is selected based on the location and size of the papilloma. Cryosurgery or laser exposure is usually used.


The most dangerous cause of large bumps on the side of dogs. Benign formations are distinguished by the fact that they can reach significant sizes. But, after their removal, there are no relapses. Lipomas are most common, which are soft to the touch and roll when pressed. There are cases when lipomas reached the size of a large apple.

Appear at any age, removed only by surgery. Malignant formations may not manifest themselves for a long time. This is why they are often diagnosed at an advanced stage. According to statistics, sarcomas, mastocytomas and squamous cell skin cancer are most common.

The initial stage is characterized by the formation of a dense nodule, which can remain in one size for a long time, but at some point its size and appearance change literally before our eyes. The final stage is characterized by ulceration of pus and blood clots, a fetid odor, and ulceration.

To confirm the malignancy of the process and determine the type of tumor, a part of the material is taken from the formation with a long-stemmed needle, which is sent to histology. X-rays are also required to exclude metastases to internal organs or lymph nodes.

A lot of attention is paid to the age and general health of the dog, since the removal is carried out under anesthesia, which not many animals can tolerate after the age of 10 years. If the pet is able to undergo anesthesia, then the tumor is removed with the capture of healthy tissue up to 3 cm.

Photo Gallery of Lump on a Dog’s Body Side

The prognosis strongly depends on the stage at which the formation was removed and whether there were metastases. When detecting any malignant processes in the animal’s body, the prognosis is always careful.

As you can see, regular examination of your dog for the appearance of any formations can save her life, since timely detection and correctly selected treatment maintains a good chance of full recovery even with malignant processes.

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