Hi stranger! Signing up for MypetMD is easy, free and puts the most relevant content at your fingertips.

Get Instant Access To

  • 24/7 alerts for pet-related recalls

  • Your own library of articles, blogs, and favorite pet names

  • Tools designed to keep your pets happy and healthy

or Connect with Facebook

By joining petMD, you agree to the Privacy Policy.

PetMD Seal

Testicular Tumor (Seminoma) in Dogs


Benign Tumor of Testis in Dogs


Seminoma is a unilateral, single, often benign (not recurrent or progressive) tumor of the testis; however, malignant forms of the tumor have been reported in rare cases. It is the second most common tumor of the testis in male dogs, typically affecting older dogs (over the age of four). Typically measuring less than two centimeters in diameter, a seminoma often causes no clinical symptoms in the affected dog and is therefore difficult to identify.


Symptoms and Types


Although seminomas rarely causes any clinical symptoms in the animal, some dogs exhibit pain due to pressure from the growing tumor. In a few cases, the testicular mass can be palpapated. Even rarer still, some tumors can become malignant and metastasize to other parts of the body.




Seminomas develop due to cryptorchidism, a fetal abnormality which occurs when one or both testes fail to descend into the scrotum from where they develop in the abdomen.




Your veterinarian will perform a thorough physical examination, searching for a testicular mass and whether or not it is palpable. Dogs with a seminoma may exhibit pain or abnormally large testis. Typically, laboratory tests such as complete blood count, biochemistry profile, and urinalysis are within normal ranges, although an ultrasound of the testicular tissue may reveal a mass. In these cases, your veterinarian may recommend performing a tissue biopsy of the testicular mass for further evaluation. If this is not possible, castration may be required to confirm the diagnosis.




Related Articles

Testicular Tumor (Leydig Cell) in Dogs
The Leydig cell tumor (LCT) is a rare, and typically benign (non-spreading) tumor...
Miscarriage Due to Bacterial Infection (...
Brucellosis is a contagious bacterial disease that affects several animal species....
Prostate Gland Enlargement in Dogs
Hyperplasia, as a medical condition, is the indicative term used to describe an abnormal...
Around the Web