Zeuter failed? My dog's testicles grew back, now aggressive.

If you have had Czar since he was a puppy and know that he was not neutered, then he is considered cryptorchid. This is a concern because testicles that are in the abdomen (not in the scrotum like they are supposed to be) are prone to becoming cancerous. I would recommend scheduling an appointment with your vet to discuss neutering him before he develops any problems. I have included more information on cryptorchidism below. https://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=2743 I hope that was helpful! Thanks for using PetCoach.

Testosterone is mood balancing and very occasionally in timid dogs castration can heighten anxiety and aggression. I would recommend working with a certified behaviorist to try and work through this and possibly medications may be required if not settling

What you may be seeing is the *bulbus glandis*. It is a normal part of the [male dog anatomy](https://www.petcoach.co/article/anatomy-and-function-of-the-reproductive-system-in-dogs). The *bulbus glandis* 'ties' a male and female dog together during mating. It doesn't mean his testicles have grown back, only that he is excited. It may also occur with an erection when a dog is overstimulated or happy. The swelling will go down as the dog calms.

Hi and thanks for using Petco Pet Education Center, formerly Petcoach! Sorry to hear about Lucas. You have two choices here. One is, of course, an exploratory to look for abdominally retained testicles or inguinal testicles not palpable when he is awake. We do occasionally see bilateral cryptorchid males. The other way to detect this would be by blood tests. A baseline hormone test is done followed by a stimulation test to detect the presence of testicles. A single testosterone test is unreliable due to the cyclic nature of these hormone levels so a stimulation test is recommended. Good luck with Lucas.

If his sac looks like it has testicles in it, this is most likely due to swelling from the surgery. This is called a scrotal hematoma, and is fairly common after a [neuter surgery](https://www.petcoach.co/article/benefits-of-neutering-castrating-male-dogs-puppies). The swelling can definitely look like testicles, but it's just fluid and blood clots from the procedure. It should resolve on its own within the next 7-10 days as long as you [keep him calm and quiet](https://www.petcoach.co/article/6-ways-to-rest-your-pet-after-surgery-or-injury) and prevent him from licking at the surgical site by using an [Elizabethan collar (e-collar)](https://www.petcoach.co/article/e-collars-for-cats-dogs-types-of-collars-and-diy-options/). The testicles themselves are removed during the neuter, so they're definitely not still there. If you have any concerns about how it looks, you can always have him rechecked next week with the vet who did his surgery to make sure everything is healing as expected.

Testosterone injections will not make the retained testicle descend. Any other hormone treatment likely will also not work. This is a hereditary problem. Your pug should be neutered and the retained testicle can then be removed also. It is better to remove it as retained testicle often turn cancerous.

This depends on whether the mass is on the scrotal skin or actually on the testicle itself. If a tumor is on the testicle then the whole testicle should be removed. If it is on the skin then the testicle does not need to be removed, but sometimes this is a hard area to perform a wide excision without removing the whole scrotum. Your dog is very young, has this mass been confirmed as a tumor by non invasive means first, like a needle aspirate? Given the age investigating in a non invasive way prior to any invasive treatment is recommended. As well, if a tumor is diagnosed, then staging to make sure there is no spread would be important prior to surgery. Also, if your pet does have a tumor then breeding a pet with a history of a tumor is not recommended. Consultation with a boarded veterinary oncologist and/or boarded veterinary surgeon in your area may be helpful before making a final treatment plan. I hope this helps and thank you for using Petco Pet Education Center, formerly Petcoach!