I went to pet smart today and was going to buy a bag of Hills science prescription md was going to only use it for an over night when we are gone for xmas eve. Plus I thought that if my non diebetic cat liked it I would switch him over he likes dry better then can. The girl told me that I needed a prescription for it and wouldn't sell it to me. I find it odd that I can buy syringes and insulin with out one but I need a presciption for food?