Ive been using Purina Pro Plan Selects for a good year now. Doggy seems to like it and its "all natural" ingredients. I used to feed her Iams for small dogs but I couldn't find it for a while (and wanted something healthier anyway). Its about 12 bucks a bag at petsmart and being a 7lb dog, it takes her a good 2 months to go through the smallest bag.