My hamster's testicle is enlarged and he's not running. Help!

I am sorry to hear about your hamster. Unfortunately we can see testicular tumors or cancer in male hamsters, so if one testicle is larger thant he other I would be concerned. If the testical is painful or turning color another possibility would be a testicular torsion, where the testical twists inside the skin cutting off the blood supply. I would recommend having a vet examine him to help determine the cause and they can recommend treatment if available. Best of luck to you!

Thanks for reaching out about your hamster and including pictures. In the pictures the testicles appear large but symmetrical. If you feel they are continuing to swell, seem painful, discolor or other problems, a veterinary visit is recommended. For now observe appetite and activity. Good luck.

I am not sure how warm it has become in your house, but I think that what you have done is a good place to start. Hamsters are most comfortable when housed between 65-75F, so if it was warmer than this, it can cause them to not want to burrow. Since you also feel like his testicles may be more swollen, I would recommend watching these closely for changes. They may be hanging lower and appear larger due to the heat, but once you have cooled the temperature in your house, they should go back to a normal position. If they continue to appear swollen, or if the activity levels continue to be abnormal, I would recommend having Ralphie evaluated by a veterinarian. I hope that gives you a place to start, and stay cool!

Thanks for reaching out. Could this be a bite wound from the other hamster? The dark skin is probably necrotic (dead) dermis. It could be an abscess. Infections should be treated with systemic antibiotics and possible anti-inflammatories/analgesia, as it could be painful. A veterinary visit is recommended, as only a veterinarian can prescribe antibiotics. Good luck.

Thanks for reaching out about Yop and including photos. Not sure if an accurate answer can be given as the pictures are slightly out of focus and not noted. If concerned, a veterinary visit is recommended to assess and provide a diagnostic/treatment plan. Monitor for food and water intake. Good luck.

That is extremely swollen! I suggest you try to ice that area (scrotum) for five minutes three times per day. But, if does not get less swollen in a couple days then you need to get him to a vet ASAP. Really, he should see vet now. That really does not look like swelling due to trauma to me...

It is possible that one testicle is retained in the abdomen. A clinical examination at your local veterinarian is essential to confirm these clinical suspicions and treat appropriately. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further. Please find the time to give us a feedback about the consultation as that will be used to improve our service.