Our 20 mo. old girl is on a Kibble diet, with her frequent treats of chicken foot and a sardine. I’ve read some posts here where people are feeding as much as 6 cups per day. We are currently using Taste of the Wild (venison) with the recommended ammount of 3-3.75 cups per day for 60-80 lb dog. Even at this, she is not too thin at all. Do various brands of kibble vary that much in terms of ammount?