My cat has allergies, licking, and hair loss. Is it her food?

Calli could certainly be allergic to some component of her food, causing her licking and hair loss. Cats most commonly develop allergies to the protein source of the food, but other allergies to fleas or environmental factors, or infectious issues like ringworm or mange can all cause similar signs. With excessive licking and scratching, skin infections can develop, which only serve to worsen itching and scratching. At this point, your best bet is to take Calli to the vet to rule out signs of a skin infection, ringworm or mange, as these would require a different course of action. If these issues have been excluded, you next need to assure that Calli is receiving a high quality flea preventative (such as Advantage, Revolution or Bravecto) regularly.

If you want to try a diet trial to determine if food allergies are occurring, you can choose either a prescription based hydrolyzed hypoallergenic diet or a novel protein diet (such as Dick van Patten's Natural Balance Limited Ingredient Diet, choosing a new protein source like venison or rabbit). To change Calli's diet, mix the old and new foods together over 5-7 days. After that time, exclusively feed the new food without adding other treats or table foods. It can take at least 6-8 weeks to see the full effect of a diet trial. I hope this helps and that all goes well!