My cat has scabs on her back after spay. Is it allergies or fleas?
I'm sorry to hear that Spaz has such uncomfortable skin lesions! Some common causes of scabs over the back include underlying allergies (to food, the environment, or fleas, ringworm, or other inflammatory issues. Make sure that Spaz is receiving a high quality flea preventative once a month (such as Advantage or Revolution), even though you are not seeing fleas. Some animals are highly allergic to flea bites, such that the fleas saliva injected after one bite can incite an allergic reaction, even if you are not finding fleas on her skin. Fleas can enter the house on our clothing and then hop over to our indoor pets.
Since her skin lesions have not responded to antibiotic injections (I assume Convenia?), she may need to try a different class of oral antibiotics, as well as corticosteroids or other allergy management medications. Spaz should go back to her vet for a recheck to discuss these other medication options. If she does have allergies, it can take a good bit of time and trial and error to help her achieve some relief. I hope that she's feeling better soon!
Updated on September 23rd, 2025