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I am sorry to hear you are worried about your dog's cyst. My name is Rebecca. I am a veterinarian and will do my best to help.
It is hard to know the best treatment until we know if this is a cyst, an infection, or a tumor/growth. The best way to find that out would be FNA, fine needle aspiration. I place a small needle gently into the cyst, without anesthesia, and get some cells or fluid to examine microscopically. Once I know what this is, I know whether to treat with antibiotics, topical medication, or if it needs to be removed.
Can you post a picture of it here?
I did get it, thanks!
This thing is pretty big. An interdigital cyst or furuncle is usually less than half that size. I am concerned this is a tumor or growth, and I would do FNA as soon as possible to find out what it is. It may be that no treatment except removing it will work.
Let me know if I can help with or answer anything else. Was this helpful?
How is your dog doing?