What is the Swelling near my Little Boston Terrier Bottom?

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Here is a Question from Soroush asking other Boston Terrier owners about a swelling on his dog.

He says : “I have noticed a swelling that has come up near my little Bostons bottom today. It feels hard but not bony. Please have a look at the photo and let me know what you think.”

Does anyone have any thoughts, experiences or recommendations? 🙂

What is the Swelling near my Little Boston Terrier Bottom?