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Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
You questioning the antibiotic choice is an absolutely excellent first step. I too would be questioning if this has developed a profound secondary infection that is resistant to our current therapy. The best approach would be for your veterinarian to submit a sample of the discharge to the lab as soon as possible for culture & sensitivity. While awaiting this your veterinarian can look at a sample of the debris in-house under the microscope to see if there is obvious bacteria, and if so what shape is present. Then based on this change to a different antibiotic or add a different one in to get a broader spectrum. I would b inclined to recommend use a different category of antibiotic.
There is a chance this is not bacterial related and instead cancer related in that this is an aggressive cancers which was incompletely removed and therefore causing issues with healing. I think the chances of this is lower than simply have development of a resistant bacterial infection, but possible. The only to know this is to get back the histopathology results (the mass should have been submitted to the lab to know what type of tumor exactly the is and if all of it was removed).
If the level of necrotic (dead) tissue is severe, then a second surgery may be needed in the future. But first we would like to get this area healthier before we go in surgically.
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