Get Your Dog Care Questions Answered by Experts
I am sorry to hear you are worried about your Boxer. Do you mean "boy Boxer", not "buy Boxer"?
I am a veterinarian and will do my best to help. My name is Rebecca.
How long has the swelling been there? Did it just happen or has it been there awhile?
Can you possibly post a picture here?
A swollen anus can be an allergic reaction, anal gland impaction or infection, a tumor on the anus. An insect or spider bite or sting could also cause swelling.
Is it his actual penis, or the sheath (prepuce) surrounding the penis that is swollen? If the penis is swollen that would be an erection most likely, or an allergic reaction/bite/sting. Same with the prepuce: infection, allergic reaction, sting or bite.
Is he able to urinate normally?
How is your Boxer today? Can I help with anything else?