You could try Science Diet Senior,see if the Pet Food store,will give you sample bags.That way,it wont cost you anything.Try diiferent Sample Bags,like Royal Canin Senior,or some,of the different specialty brands,that they have ,like Go,Or Wellness.Bless You,for wanting,to help,that Poor Cat,you sound like a Nice Young Purrson,and The Found Cats,all MEEEOOOW For You.