u/Confident_Summer8462

I’m adopting two ragdolls brothers in a month and I have been doing research and getting everything ready. One had an allergy to food and started losing his hair on his back legs. What are some things I can do for him to help him once I get him? The owner said it was from the food, and I plan to switch their food when I get them to purine liveclear. I also plan to add a multivitamin powder to their food.