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Hello. Welcome to JustAnswer. I am Dr Z. I'm reviewing your question now, and will post back with a reply ASAP.
Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 30 years of experience and would be happy work with you.
This is definitely something that needs to be evaluated with a thorough physical exam by a veterinarian. It is impossible to diagnose most growths just by the way they look or feel, but there are other ways to determine the seriousness of the growth.
There is a test called a fine needle aspirate (FNA) which can be performed by collecting a sample of cells from the mass with a needle and then examining under the microscope. This can usually be done right in the clinic. It is not always definitive enough to let you know the exact cause of the lump, but it may help to make the decision of if anything else needs to be done, like surgical removal. Some growths are easily identified as benign and that is all that needs to be done unless the growth is of a size to be bothering the dog. if it is infected, your vet will also be able to determine if antibiotics are needed.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.
Yes, that is definitely ulcerated and very likely will need to be removed. It would be best to have a biopsy performed as well so that the type of tumor it is can be identified to see if any follow up treatment is needed.
You are most welcome. Good luck with him.
Probably not as long as you try to keep it clean and keep him from bothering with it, but the sooner the better.
I love chihuahuas.