Hi! I adopted my cat in January and since have been trying out different foods from raw with a supplement to tiki tuna, but he had a hairball and vomited once, so I bought the chicken and pumpkin. After that he vomited two times, so I am trying the raw freeze dried turkey, which he might tolerate better. I thought a raw diet would prevent digestive issues, but I think I have given him too much tuna or chicken liver, which I added to his food. Hopefully he will like the turkey freeze dry and we can stick with it, but I wanted to know which supplement can aid in digestion and hairball prevention. Thanks!