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Thank you for using Just Answer. My name is Rebecca; I am a veterinarian. Please give me a moment to type my answer.
I am sorry to hear your dog has this ulcerated tumor that may be cancer. The only way to know if surgery will be a cure, or if there is another treatment, is to find out what this is.Before doing surgery, I would do FNA (fine needle aspiration) or an "impression smear" of the tumor. This will get cells to be examined under the microscope, and should tell us not just if it is cancer, but what kind. Different kinds of cancer behave differently. For instance, a sarcoma almost always comes back after surgical removal. A mast cell tumor can be cured by completely removing it, if you get it all. A skin melanoma is usually cured by surgical removal.
No, it could be any of the ones I mentioned, or other types of tumors.An impression smear is completely noninvasive; we press a glass slide on the ulcerated area and then look under the microscope. FNA is only slightly more; we use a tiny sterile needle to get cells from inside the tumor.The drainage could be blood, infection, cystic fluid. Again, looking at a sample of the fluid under a microscope should tell us what it is.
Please let me know how he is doing, and if my answer was helpful!