I've got a 160 lb American Mastiff. He eats about 6 cups of dry food per day, Science Diet large breed lamb and rice. Honestly, the food is a minor expense compaired to the routine vet bills, training, crates, etc. for a healthy dog. Before Gromit, we had a 70 lb Dalmatian, and I don't see any big difference expense-wise between the two.
Also, you can shop around for the food. Some of the warehouse clubs carry pretty good brands for a whole lot cheaper than the grocery store or Petsmart.
Also, you can shop around for the food. Some of the warehouse clubs carry pretty good brands for a whole lot cheaper than the grocery store or Petsmart.