Hi there and thanks for your question. This will be a hard one to answer without actually examing your dog and the growth, but I can give you a few ideas as to what could be going on.
There are a few things that are "common" to find as growths on a boxer's ear. One, is something called a histiocytoma. A histiocytoma usually looks like a smooth pink button. It can be very small or it can be a couple of inches in diameter. If this is a histiocytoma, then they usually get better on their own within a few months. We don't usually do surgery to remove them.
However, the other possibility is something called a mast cell tumors. Boxers seem to get mast cell tumors more often than other dogs. While some mast cell tumors are benign, some can be quite serious. They can come in different shapes and sizes but generally tend to be a little red.
I would highly advise a vet visit for an exam of this lump. Your vet will probably do a fine needle aspirate. It is usually quite easy to tell the difference between a mast cell tumor or a histiocytoma. If it is a mast cell tumor they will want to remove it soon.
I hope this information helps! If you have more questions regarding this problem, just hit reply. If I am online I will respond right away. Otherwise I will respond as soon as I come online again. Or, if my answer is sufficient, then please hit accept. Thanks!
Dr. Marie.
The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would highly advise contacting your regular veterinarian.
OK..rough and black doesn't sound like a histiocytoma. It could be a mast cell tumor or it could be something called a melanoma. Again, melanomas can be either benign or malignant.
I really think a fine needle aspirate is in order. If this is a mast cell tumor then removing it as soon as possible is very important! If your vet removes it they will likely send it to a pathologist to find out what "grade" it is. This will tell us if it was cured by removing it or if we expect it to come back again.
Veterinarian
Compassionate licensed veterinarian with >20 years experience with cats, dogs and pocket pets