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Hi this is Dr. Hill. It sounds like Gypsy may have a mass in her mammary gland. This is not uncommon in older dogs, especially if she is not spayed. Some tumors will be cystic (pockets or fluid) but can also become infected. Gypsy needs to be seen by a local veterinarian to see if the mass is infected and to discuss whether or not to remove it. Please ask any follow up questions.