At the level of the testes, tumors can develop from different cell types, each of which has its own properties.
Depending on which cell type the tumor originates, the tumor can behave differently (e.g. by disturbing the hormone balance).
Most of the time, however, a testicular tumor does not cause symptoms and is a coincidental finding. If there are clinical signs, it is the result of metastasis or a disturbance of the hormone balance.
- Sertoli cell tumor. What's special about Sertoli cell tumors is that in 50% of the cases too much estrogen is produced, which can lead to symmetrical bald spots, swelling of the mammary glands, milk production and / or attracting other male dogs to even spontaneous bleeding and a greatly increased risk of serious infections. This tumor spreads in 15% of the cases.
- Seminoma. This tumor mainly only takes up space and spreads in 15% of the cases.
- Leydig cell tumor. This tumor mainly only takes up space and very rarely spreads.
These tumors are most common in older male dogs with a median age of 10 years.
A higher risk for the development of this tumor type has been reported for Boxers, Afghan Hound, Weimaraner, Shetland sheepdog, Collie and Maltese dog vs other dogs.