I just learned a very costly mistake/lesson. My dog in the past two months has had two operations to remove fat deposits. I walk him regularly for an hour to an hour and a half each day but I was over feeding him.
The last operation removed a deposit weighing 28 lbs on his right side. The whole deal cost me 1400.00, yeah I might be certifiable.
Anyway if you go on www.iams.com, you can punch in your dogs weight and it'll give you the amount of food your dog requires (approximately). I was killing my mutt with kindness. If you don't feed them Iams with a little looking you can figure out the calories per day they are recommending. Example, take the calories per cup, x the cups per day recommended for total calories.