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Stud Tail in Dogs

Stud Tail in Dogs - Symptoms, Causes, Diagnosis, Treatment, Recovery, Management, Cost

What is Stud Tail?

It is very common for stud tail in dogs to become infected (pyoderma), which is one of the most commonly treated skin conditions in dogs. It is a secondary bacterial infection of the skin and hair follicles that is easily treated with antibacterial shampoo and medication. The symptoms of pyoderma infection are redness, swelling, and crusty lesions. It can also cause hair loss and permanent baldness if not treated right away. Without treatment, the infection can spread into the deeper layers of skin where it may result in septicemia. Although this is rare, it is life-threatening so it should be considered.

The supracaudal gland (violet gland), which is found on a dog’s tail, secretes oils, lipids, and protein. Sometimes, this gland secretes too much androgen, which can raise levels and can cause a bare spot in that area called stud tail (supracaudal gland hyperplasia). This spot may be greasy or oily and can block the pores, causing blackheads and inviting infection. The reason for the overactivity is unknown, but it is thought to have something to do with marking their territory by leaving their scent. Stud tail can be very irritating to your dog. This infection is called pyoderma and will need to be treated by a veterinary professional.

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Symptoms of Stud Tail in Dogs

The symptoms of stud tail in dogs vary quite a bit depending on the breed, age, and amount of androgen secreted. In some dogs, there may be no irritation or redness at all unless it gets infected, which is common. The most often reported symptoms are:

  • Bald patch on tail that may be a greasy spot
  • Inflammation (bulge) of the tail in affected area
  • Oily dark patch on tail
  • Matted hair at the base of the tail
  • Foul odor and redness if infected


There is only one type of stud tail, but the secondary infection may be caused by one of these organisms:

  • Corynebacterium
  • E. Coli
  • Micrococcus
  • Proteus
  • Staphylococci
  • Streptococci

Causes of Stud Tail in Dogs

While the cause of stud tail is not completely understood, the most common causes seem to be:

  • Overactive androgen levels
  • Fleas or other parasites that block the gland
  • Infection

Diagnosis of Stud Tail in Dogs

Your veterinarian will need to know your dog’s health history and whether you have given him any medications. It is also necessary to do a comprehensive physical examination, which should include a detailed skin and coat assessment, vital signs, palpation, and auscultation. A skin scraping will be taken for cytological analysis. Bacterial and fungal cultures, antibiotic sensitivity tests, chemical blood analysis, urinalysis, fecal examination, and complete blood counts are also important to make sure your dog does not have any underlying conditions that need treatment. The veterinarian may also decide to do a biopsy by taking a small piece of tissue from the area to examine under a microscope. Other tests your veterinarian may consider are x-rays, ultrasound, or CT scans to rule out other disorders.

Treatment of Stud Tail in Dogs

If your dog’s stud tail is not infected, the veterinarian may decide just to use topical ointment and antibacterial shampoo. However, if your dog has any sign of infection, the veterinarian will most likely give him an antibiotic injection.


There are several types of antibiotics that your veterinarian can use to help get rid of pyoderma such as amoxicillin, doxycycline, tetracycline, cephalexin, or ciprofloxacin. Any of these can be given by mouth or injection. If using an oral antibiotic, three to six weeks is necessary, depending on the severity of the infection. The type of antibiotic depends on the type of organism that is causing the infection such as E. Coli, Corynebacterium, Micrococcus, Proteus, Staphylococci, or Streptococci. In addition, a corticosteroid injection can help reduce the inflammation and itching. Topical ointment or cream will also be prescribed for use three times per day.


Another important part of treating both stud tail and pyoderma infection is antibacterial shampoo. Some of the types of shampoo include antiseborrheic shampoos with chlorhexidine or benzoyl peroxide. This should be used on the affected area at least two times a day.

Removal of the Gland

In severe cases of recurrent infection, surgery to remove the gland will be done. However, this is not common and only done in severe cases.

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Recovery of Stud Tail in Dogs

Stud tail is usually not a serious illness, but the secondary infection can get severe if not treated. If your dog is treated right away, the prognosis is excellent. However, there are cases when the infection does not respond or it spreads deeper into the skin. In these cases, the infection can spread to the blood (septicemia), which is life-threatening. Treatment must be given immediately and the recovery may take longer, but with care, the prognosis is still good.

Stud tails are prone to infection. To avoid high vet care expenses, secure pet health insurance today. The sooner you insure your pet, the more protection you’ll have from unexpected vet costs.

Stud Tail Questions and Advice from Veterinary Professionals


American Bulldog



Eight Years


11 found this helpful


11 found this helpful

My pet has the following symptoms:
Hi, my name is Amanda and I have an 8 1/2 year old American Bulldog. She has a black small at the base of her tail that started out small but is now a big black spot. It is crusty and busts open sometimes and now has a hole in the center that Oozes sometimes. I have no idea what this could be and am worried. Do you have any suggestions on what this may be?

Sept. 28, 2020

Answered by Dr. Michele K. DVM

11 Recommendations

Thank you for your question. That looks like a very deep, very chronic infection. I would imagine that hurts her quite a bit. She needs to see a veterinarian, as she probably needs antibiotics. They may need to treat her with antibiotics for quite some time to help get rid of that.

Oct. 9, 2020

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Catahoula Leopard Dog




9 Years


10 found this helpful


10 found this helpful

My pet has the following symptoms:
I have a 9 year old neutered Catahoula with allergies which are being treated with apoquel. About once a year he smells terrible for several weeks. I finally figured out where the smell is coming from...it is where his tail bone and tail meet. There is no hair loss or scabby or oily skin just the smell. What do you think?

July 27, 2018

10 Recommendations

Stud tail is an uncommon condition especially in neutered males (seen more commonly in intact males), you should check with your Veterinarian whether this is the issue or not since it is unusual to be occurring at only certain times of the year. Without examining Winston I cannot say for certain what the cause is. Regards Dr Callum Turner DVM

July 28, 2018

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