What is the cost for a bag of food for a dog
1 According to The Dog Food Project, dog food will cost $160-$250 per year for a moderately active mid-sized dog. 2  The overall average price per year is $100-$300. 3  This price largely depends on the size of the dog and the quality of the dog food. Therefore, the higher quality of the food, the longer it will last. 2  A wellness type of dog food that is recommended for dogs that are either on a diet or need a special blend formula can cost anywhere from $23 to $55 per bag.