Hi! My baby is 1.5 years old and sterilized. I've been using Advance sterilized for so long. But i think changing food brand periodically is beneficial. Because all of them have different contents. Also three weeks ago I learned my cat is coronavirus positive. Even though I give Phytomine to him, I want to use dry food to help his immune system. Because of living in Turkey, I can not reach all brands. What are your recommendations about cat foods? Thanks for your answers...