Experienced and professional animal trainer provide their insights in answering this question :
A. It could be an anal gland infection/abscess or a tumor. Have him examined by a vet to determine the exact cause. If it is an infection, your vet may need to drain the abscess and prescibe an antibiotic. If it is a mass, your vet can do a fine needle aspirate or biopsy to determine if it is benign or cancerous.

How to Identify Common Pet Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced pet care professionals :

Perianal adenomas appear as slow-growing, non-painful masses around the anus. They usually emerge in the hairless area of the perineum, but technically, they can appear in the prepuce, scrotum, and under the tail. They`re typically superficial and are only rarely adhered to deeper tissues.
The treatment for infected anal glands in dogs is usually a combination of antibiotics and topical medication that is infused directly into the anal sac by the veterinarian. Surgery may be required in some cases to remove impacted or abscessed anal glands.
In the case of benign perianal adenomas, you many see one or more small, round, pink, hairless, slow-growing nodules around the anus. Although they usually grow around the anus, they can grow in the prepuce, scrotum, and under the tail. Occasionally they will ulcerate (break open) and become infected.
Skin squamous cell carcinoma is the most commonly diagnosed form of skin cancer in dogs and typically affects older animals. These tumors appear as raised wart-like patches or lumps that are firm to the touch and are most often found on the dog`s head, lower legs, rear, and abdomen.
Anal warts (condyloma) are warts in and around your anus. They`re caused by human papilloma virus (HPV), which is spread through sexual or skin-to-skin contact. Symptoms include itching, bleeding or feeling a lump in your anus. Most anal warts need treatment with topical medication or surgery.
Anal sac disease is very common in dogs. The sacs frequently become impacted (plugged), usually due to inflammation of the ducts. The secretion within the impacted sacs will thicken and the sacs will become swollen and distended, making it painful for your dog to pass feces.
One of the best ways to identify a potentially cancerous lump is to evaluate how that tumor feels when touched. Compared to the soft, fatty characteristics of a lipoma, a cancerous lump will be harder and firm to the touch, appearing as a hard immovable lump on your dog.
Dog Cyst vs Tumor: How Do I Tell The Difference? Cysts are fluid-filled sacs under the skin that are usually easy to move around, while tumors are typically more solid. A cyst also may drain a white, yellow, or green discharge.
Squamous cell cancers are the most common type of anal cancer. Squamous cell carcinomas make up around 90 out of 100 (90%) of all anal cancers. They are also called epidermoid cancers. This type of anal cancer starts in squamous cells, which make up the lining of the anal canal and anal margin.
Most anal cancers are related to human papillomavirus (HPV) infection. Risk factors for anal cancer include the following: Being infected with human papillomavirus (HPV). Having a condition or disease that causes a weakened immune system, such as human immunodeficiency virus (HIV) or an organ transplant.
Mast cell tumors are quite serious when identified in dogs. If untreated they can cause anaphylactic shock or if they progress into a more aggressive form they can metastasize and ultimately lead to death.
There are several reasons why your dog may develop bumps and lumps. It can be a benign growth, skin infection, allergic reaction, or something more serious like cancerous tumors. Consult with your vet to get an official diagnosis and treatment plan.
A perianal hematoma looks like a blue bruise under the skin or a dark-purple collection of blood near the anus. You might also be able to feel a small lump, ranging in size from about a small raisin to a tennis ball. Other symptoms of a perianal hematoma include: bubbling or bulging skin near the anus.
A perianal abscess is a boil-like lump filled with pus found near your anus, rectum or perineal area (the space between your genitals and anus). It happens when one of the glands in your anus becomes clogged and infected.
Anal gland abscesses are extremely painful and can burst if they aren`t treated quickly. Contact your vet ASAP if you think your dog has an anal gland abscess. Never try to treat an anal gland abscess yourself; you could cause serious damage and pain.
An anal sac tumor is a tumor made up of cells originating from the glands of the anal sac. The tumor usually grows quickly and has a moderate rate of spread. One of the biggest problems with anal sac tumors is that they can spread elsewhere in the body (metastasize). Their growing size can make removal difficult.
In some cases, anal glands can become impacted or infected (abscessed). This is usually due to a long-term inability to empty the anal sacs during normal defecation. If your dog`s anal area becomes reddened or you see pus around its anus, this may indicate a problem with its anal sacs.
Treatments for a lump on your anus will depend on the underlying cause. A perianal haematoma can be treated by taking over-the-counter painkillers or applying a cold compress several times a day. In severe cases, you may need surgery to drain and remove the lumps.
A swollen anus may be very uncomfortable, but in most cases, the causes are temporary and pose no long term risk. Home remedies for anal swelling include warm baths, a high fiber diet, hydration, and topical medications.
We must sample lumps, and evaluate the cells under a microscope to determine what they are. There is no other way to know whether a lump is benign or malignant. Your veterinarian must perform a fine needle aspirate and/or a biopsy to make an accurate diagnosis.
Cancerous or malignant tumors can be hard or soft. The feel of a mass and whether it bothers your dog has little to do with whether it is cancerous or not.
Lipomas are characterized as small, hemispherical lumps that can be felt just under your dog`s skin. The lump will likely feel somewhat soft and you will be able to move it a little, although it`s important to keep in mind that firmer, stationary lipomas are also fairly common.
Whatever type of lump you find on your dog, it`s always a good idea to have a vet check it out as soon as possible. Cysts might not be life-threatening, but they can cause problems as they grow or if they become infected.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My schnauzer male has a huge lump just 2 to 3 cm left of anus . It seems to be swollen, very hard and irritated. Walter is licking it constantly
ANSWER : A. It could be an anal gland infection/abscess or a tumor. Have him examined by a vet to determine the exact cause. If it is an infection, your vet may need to drain the abscess and prescibe an antibiotic. If it is a mass, your vet can do a fine needle aspirate or biopsy to determine if it is benign or cancerous.

Q. My dog keeps licking himself in the same area, what does this mean?
ANSWER : A. Excessive licking in one area often leads to a condition called Acral Lick Dermatitis or Lick Granuloma. By constantly nibbling on one spot, which is usually on one of front legs, dogs can cause skin irritation and inflammation and not uncommonly skin infection.

There is a long list of possible causes of this problem. In many dogs this is purely a behavioral issue related to anxiety, boredom or stress. Dogs with joint pain like to lick over the painful area to alleviate pain. Skin allergy or infections, skin foreign bodies predispose dogs to Acral Lick Granuloma as well. Finally, low thyroid hormone level is believed to play a role in developing Lick Granuloma.

Treatment is often long, and close cooperation between the owner and the vet is required. The effort should ultimately be directed to identify and treat the underlying cause.

Read Full Q/A … : Excessive Dog Licking

Q. Small lump on my dog’s throat, what should I do?
ANSWER : A. Lumps and bumps on the throat or neck can be caused by a wide range of things. Depending on the lumps size, if it is under the skin or appears on the skin itself, and its location on the throat can all indicate different things.

There are a large number of structures in the neck there ranging from thyroid glands, nerves, salivary glands and even lymph nodes. Illness, disease or irritation can all cause swelling or issues there. You may also see additional symptoms such as trouble swallowing, drooling, lethargy or changes in weight and appetite to help narrow down the cause of the lump. Testing via blood work or an X-ray may help to determine the cause and proper treatment.

Lumps and bumps on the skin can also be caused by allergies such as an allergic reaction or sting, or even an abscess under the skin. Allergies are usually treated with an allergy medication to help stop the response and any itching or redness. Abscesses (cuts or scrapes that get infected and swell with fluid) are usually hot or painful to the touch and may ooze debris. These are usually drained at a vet, and then treated with antibiotics.

If the cause of the lump is not known, your vet may also recommend taking a sample of the lump to send to a Lab. This can help to determine what exactly is causing the lump and how to treat it.

Q. Why does my pup lick everything?
ANSWER : A. Puppies are very much like babies and young toddlers, and will explore the world with their mouths. This may include chewing objects, or licking them. Puppies and other more submissive dogs may also lick people as a way to “appease” them and try to gain favor. If your dog is licking objects, then using something such as a no-lick spray and providing appropriate other toys to explore can help curb the behavior. If you are the one being licked, then ignoring your dog or getting up and moving away when the licking begins can help stop the behavior. Be sure, however, to still give your pup lots of praise when NOT licking!

Q. My cat just developed extreme irritability on his butt and sides. He’s a 6 year old Maine Coon. It seems like he is in pain. No parasites or fleas.
ANSWER : A. It is possible that a sore or skin problem has started on him that is causing your cat some stress. If the irritation is situated around his back end and anus, constipation or diarrhea can sometimes cause irritation. The anal glands are also located in that area and can become full and irritated.

if he is experiencing changes to the skin or hair on his back and sides, it is possible that an underlying infection such as skin or fungus, or even a metabolic condition are causing the change. Preventing him from licking or chewing at the area can help prevent secondary infections from forming. If the irritation continues or worsens, then scheduling a vet visit can help determine the cause.

Q. I recently added a new 2 month old female kitten to my house and my male 5 month the old kitten has turned aggressive and chases the kitten down..
ANSWER : A. It is possible it could be play behavior but without seeing it in person, hard to say. Is the male kitten neutered? You may want to consider doing so. Also, try re-introducing the kittens slowly by creating a safe space for the new kitten behind a closed door in a room. Keep her there for at least a week so she is protected but your male is still able to smell her. After a week or 2, you can then graduate to using a baby gate so they can then not only smell each other but safely see each other as well. If that is going okay, after another few days you can bring the gate down. Also, be sure to have feeding bowls in separate locations and at least 2 litter boxes.

Read Full Q/A … : Ragdoll Cats

Q. Why does my dog keep licking her butt alot? We can’t take her to the vet. But, after the bath, she seem fine and not lick her butt alot.
ANSWER : A. I would ask the vet (or groomer who gives the bath) if they are expressing your dog’s anal glands during the bath. This is a very common thing for them to do and it would explain why your dog is so comfortable after a bath. It would also explain why your dog licks her bum so often! Dog’s have these bothersome glands that are located right next to their anus called anal glands. These glands fill up every week or two with fluid (in some cases, very thick fluid) and many dogs have a hard time expressing this fluid on their own. This causes them a great deal of discomfort and in turn causes them to lick their bum! Some dogs will even scoot their bum on the carpet in an effort to empty the glands. Your vet (or your groomer in this case) can help you and your dog out by emptying these glands out on a regular basis and keeping your dog comfortable.

Q. My dog has no fleas, but is scratching and licking continually. He has been through a round of prednisone and it hasn’t helped. What can I do?
ANSWER : A. Itching can be caused by more than just external parasites, and if your dog is already on a flea medication, then it is possibly not the case. Itching can indicate anything from allergies to even minor skin infections causing problems. If your dog has been treated with prednisone (a steroid that inhibits the immune system) and it did not help, then looking at other options may help.

Food allergies are very common in dogs and can present with itching and licking all over the body rather than on just one spot. Common food allergens include ingredients such as wheat, corn and soy products, however dogs can be allergic to almost anything! Starting a food trial of an allergen-friendly diet from your vet or pet store that avoids these common ingredients may help. The food should be switched over a period of 7-9 days and then given about a month to decide if it is helping.

Small skin infections or yeast in the skin can also cause itching, however this itching is often more specific to a certain area of the body (such as the toes, or base of the tail). Your vet can perform a skin scraping of the area to be cultured at a lab to look for any yeast or bacteria. If they are present, a medication given either orally or placed on the affected area can clear up the infection.

In some cases, licking and chewing can actually be due to a boredom or anxiety behavior. Dogs may lick one spot obsessively to the point of creating sores or wounds in the area. Stopping your dog from licking and chewing either through the use of dog booties, no lick strips, T-shirts or even Elizabethan collars can break the habit and give the area time to heal. Licking and chewing can also cause the spread of bacterial infections so should be deterred even if not behaviorally caused.