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Has the hair coat been becoming any thinner than usual? The pictures I could not quite tell if there was a thinning in the areas. The red dots appear to be localized hair follicle infections. Are these red areas very itchy?
Your cat is not experiencing any skin or itching problems?
When the flea infestation occured, had we not been on any flea products prior to that? What brand of flea product are you on now?
If she had fleas last month the flea eggs may have fallen off of her into the environment ( your house) then as they hatch they can hop back onto the dog. It can take up to 3 months of flea treatment on the pets to totally break the flea cycle. This could be one likely reason we are so itchy and self inducing the sores. Once they become itchy like this they are very sensitized to the itch. Even a small number of fleas that hop onto us before the Frontline kills them can induce a lot of itching. Perhaps you can discuss with your veterinarian this tomorrow, there is a great product called Apoquel from Zoetis. It stops itching and is much safer and less side effects than prednisone to stop the itch. If there was any potential allergy issues, the Apoquel will help a lot too. However from what you have told me, I have seen this many time3s with residual flea problems. Keep administering monthly flea products to both of your pets for a minimum of 3 months.
You can try to clean up the bedding areas as best as possible where the pets sleep, however it is never possible to remove all the flea eggs. This is why best to focus on continual products administration monthly to break the cycle. If you have any other questions please let me know. Have a great day. Dr. Mike