The bulbus glandis is a normal part of male dog anatomy. Sometimes visualized as two enlarged, round swellings under the skin on either side of the penis, the bulbus glandis is made up of erectile issue.
When a male dog is excited, blood flows into the bulbus glandis causing the characteristic engorgement of these round structures.
Pictures of Bulbus Glandis on Dogs
The bulbus glandis, when engorged during mating, serves to retain the male’s pens in the vagina of the female, just before, during, and after ejaculation. This “tie” during mating may last from 20 minutes up to an hour.
It is completely normal for the bulbus glandis to engorge and be externally visible on all male dogs, even if they are neutered.
How Do You Recognize Swollen Bulbus Glandis?
The bulbus glandis, when engorged, appears as two:
- located on either side of the penis.
They are further cranial (towards the head) than the testicles and can appear in both intact and neutered male dogs. When the dog is no longer excited, they will completely disappear.
Is it a Swollen / Engorged Bulbus Glandis or is it Something Else?
The best way to know if the structure you are seeing in your male dog’s groin is the bulbus glandis is to ensure that the structure disappears from visibility when the dog is no longer excited.
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If the bumps persist, if one side is larger than the other, if there is just one mass, or if the penis is stuck outside of the prepuce, your dog needs to be seen by a veterinarian as soon as possible.
These different appearances could indicate an injury or tumor:
2. One-sided mass
If one side is larger than the other, if there is just one mass, please reach out to your veterinarian.
Is there anything you can do at home if you notice a swollen bulbus glandis?
If your male dog has an engorged bulbus glandis, there is nothing that you need to do. The condition is not painful for the dog and is a perfectly normal occurrence.
When to call your veterinarian
If the engorgement of the dog’s bulbus glandis persists for longer than two hours or if the penis is outside of the prepuce, you should seek veterinary care.
Frequently asked questions
Why do dogs have a bulbus glandis?
This structure is a normal part of male canine anatomy. The bulbus glandis engorges with blood during mating to retain the penis inside the female’s vagina before, during, and after ejaculation.
Does a swollen bulbus glandis cause any pain for the dog?
No, an engorged bulbus glandis is not painful for the dog.
Does neutering your dog remove the bulbus glandis?
No, the castration (neuter) surgery consists of surgically removing the make dog’s testicles. The bulbus glandis is a normal anatomical feature and will be present in both intact and neutered dogs.
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