Petco recommended Vital Cat Food when I said my cat could not keep any food down and was very thin. Three weeks in to feeding Vital exclusively, my cat is gaining weight and has not had any problems with her digestion. I suggest trying this food feeding in small quantities at first as it will be a significant change from most dry cat food which lists corn as the first or second most abundant ingredient. Unfortunately my cat cannot say "thanks" but her behavior and attitude changes tell me everything I need to know.