I think it would cost more than $100 a month - maybe not now, but definitely as she gets older. A 70 pound adult needs (according to the Wellness site, for Chicken and Sweet Potato) would need as much as 4 or 5 cans a day, depending on weight. That's 120 to 150 cans per month at around $2 a can at the case price, up to $300 a month!