Updated On September 23rd, 2025
My puppy has what looks like a balloon or bump near his penis. Should I be worried?
5 Answers
Published on March 31st, 2015
If what you're seeing looks like a symmetrical swelling near the base of his penis in front of the scrotum, what you see is likely the *bulbus glandis*. This structure is a normal part of the male dog's anatomy. The *bulbus glandis* swells during [mating](https://www.petcoach.co/article/anatomy-and-function-of-the-reproductive-system-in-dogs) which causes the dogs to tie or 'lock' together during the act. It may swell when the dog is excited, even in a neutered dog.
61Pet Parents found this answer helpful
Published on August 16th, 2019
It is likely you are seeing a swelling in Cloud's bulbous penis. This swelling will eventually go down on it's own. Its the structure in the penis that allows to 'lock' during mating. I hope this helps and please feel free to post any additional questions.
1Pet Parents found this answer helpful
Published on August 14th, 2018
What you may be seeing is Willo's bulbourethral glands. These are glands that swell when dogs get sexually excited, and sometimes when they urinate. It's a normal part of a dog's anatomy. I hope this helps!
3Pet Parents found this answer helpful
Published on July 22nd, 2017
From your description, it sounds like you are seeing the bulbourethral glands - these are two glands that look and feel like round, firm lumps on either side of the base of the penis. They tend to be especially noticeable when the dog is excited, and/or when the penis is erect. These are a normal part of his anatomy, and nothing to worry about :) If you want to make sure that this what you are seeing, you could always ask your vet to check the next time Olaf goes in for a visit.
1Pet Parents found this answer helpful
Published on December 11th, 2016
I'm wondering if what you were feeling was Tuck's bulbourethral glands. These are located between the penis and testicles, and become enlarged when the dog is aroused or excited. They will then disappear after those feelings have passed. It is a normal part of a dog's anatomy :-)
1Pet Parents found this answer helpful
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