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HI this is DRB and I would be happy to assist you. First you might be disappointed to know that a round lesion does not mean it is ringworm. Many lesions can be round unfortunately. Has your dog been around any other dogs or cats?Or does anyone in your family have ringworm? Most animals actually get it from people if that is what it is.....can you give me some more info...
Ok, so let me give your more info: so this type of lesion could be pyoderma which is a skin infection and that would be the most likely explanation based on the fact that your dog has had allergies for so long. Ringworm is possible but doubtful as is demodectic mange. So I would bet that what you are seeing are most likely epidermal collarettes which are round an usually represent a staph infection due to being secondary to an allergy. The most important thing your vet can do besides treating the skin infection would be to get to the bottom of the underlying allergy so your dog can be allergy free and stop getting secondary skin infections. So your dog most likely has either food related allergy which is under diagnosed or a environmental allergy. Food related allergy requires a 12 week food trial with a novel protein. Environmental allergy requires daily apoquel. If your vet does not know what they are doing with this find a dermatologist. Your dog should not have to continue to suffer.
If you have worked at a shelter as you indicated above and you and your husband had spots then it is certainly possible that these could be ringworm spots as well as the other things I have indicated above. But this should be able to determine easily with a culture. I hope all this helps you. Just remember, dermatology issues can look similar and diganostics ate needed to get definitive diagnosis. I have been concentrating on dermatology for 25 years and it always requires alot of detective work. Sincerely, DRB
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I reviewed the pictures but cannot really tell you anymore than what I already have without diagnostics. If you dog truly has a food allergy then that will require a food change to a novel protein prescription diet, not something you can buy over the counter. You need to do a 12 week trial with no other food or treats and also no flavored heartworm prevention. Iverhart max is ok or proheart injection. This cannot be done with OTC foods. I hope this helps. If you have other questions or concerns leave them here and I will respond in the am. Sincerely,DRB
Please let me know if you have additional questions. Sincerely, DRB