I average a bag a month per dog. A decent bag of food is between $30-$60 a month. I feed Natures Domain (Costco) and I had had great results. I do not feed puppies puppy chow unless they look like they need to put on some weight. I feel the same way about wet dog food. It's not really necessary. Don't forget to figure in the initial costs as well ( crate, kennel run, bed, shots etc). That's really exciting though. Make sure your pup comes with a health guarantee and health certs of the parents. It will save you a lot of money in the long run.