My dog has a growing lump. What could it be and should I worry?

Hi there and thank you for using Petco Pet Education Center, formerly Petcoach to address your concern. It is difficult to say for sure what these tumors are just by looking at photos. However, that being said, the light pink mass I would suspect to be benign / non-cancerous and it looks like what we call a sebaceous adenoma. The dark purple mass looks a little more suspicious for a malignant / cancerous mass. I would recommend having a veterinarian examine both to be on the safe side. The vet can insert a small needle into both masses and look at their cells under the microscope, a test called a Fine Needle Aspiration (FNA). I hope this helps guide you in the right direction! Please let me know if you have any other questions or concerns and I would be more than happy to help you further. Please remember to rate this answer as helpful or not. Thank you!

Hello. Your picture is quite blurry, but this does look like a cystic structure or possibly a tumor. You should have this looked at, hopefully at your earliest convenience. Thanks for using Petco Pet Education Center, formerly Petcoach.

Thanks for using Petco Pet Education Center, formerly Petcoach! These could be benign or malignant growths. These could even be due to an infection or an allergic reaction like you pointed out. This is often differentiated by an exam and a test called a fine needle aspirate (FNA) which is a pain free, inexpensive and easy procedure which in most cases will help reach a diagnosis. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have him evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good day!

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be a benign or malignant growth. Based on its appearance, this is most likely a benign sebaceous adenoma. This is often differentiated by a test called a fine needle aspirate (FNA) which is a pain free, inexpensive and easy procedure which in most cases will help reach a diagnosis. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have him evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good one!

I'm glad to hear that Colette does not seem to be bothered by this mass! The only way to definitively determine the type of mass present (benign or malignant) is through a fine needle aspirate and/or biopsy. Without determining the type of mass, I can't say if this is something that should be monitored for changes or if it should be surgically removed. Since it has noticeably grown in just the past few days, your safest bet is to take her to the vet to have the mass evaluated. I hope that all goes well!

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! It's hard to say with out seeing a picture or examining Charlie. I always recommend any new skin bump be looked at by your Vet. If you want to watch it that is fine, but if it changes or rapidly grows it should be looked at. Sadly both benign and cancerous growth can look the same. If you want to post a picture I'd be happy to look at it. Have a great weekend!

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be a benign or malignant growth. There is no way of knowing what it is just based on its appearance. This is often differentiated by a test called a fine needle aspirate (FNA) which is a pain free, inexpensive and easy procedure which in most cases will help reach a diagnosis. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have her evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good night!