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Thank you for using Just Answer. My name is Rebecca; I am a veterinarian. Please give me a moment to type my answer.
I am sorry to hear you are worried about Jasmine's scratching.
Do any of the other cats go outside at all, or do you have a dog? Fleas are still a possibility if any of your other pets go outside, or when the third cat came into your household if he had been an outdoor cat. If a cat is allergic to flea bites, it can take only one or two fleas to set them scratching all over, and it is hard to see just a couple of fleas on a cat. Using a good flea medication or the Seresto collar might be a good idea.
Food allergies can also make a cat itchy, usually around the face and ears. Switching back to the old food might be a good idea as well. Let me know what else I can answer for you today!
If you are going to change the food back, I would feed it to all the cats. Make the change gradually, start adding the new food in with the Meow Mix, and then gradually lower the amount of Meow Mix until they are all eating the new food.
You can try giving 5 to 10 mg of Benadryl for itching, twice daily. It does come as a liquid, for children. Make sure it is just Benadryl (diphenhydramine) with no other ingredients like acetaminophen or pseudoepedrine.
Let me know if this helps and if you have any other questions!
I hope you were able to see my response; I have not heard from you! Let me know if my answer was helpful and how she is doing.