Hello how may I help you? how much dog food do i need for a week? I can help with your pet needs! What kind of dog do you have a st. bernard Okay, let me check on this. It appears a St. Bernard will consume 10 lbs of food a week. This could vary based on age of course sounds about right I'm glad I could assist you. Anything else today yes is that wet or dry food? That is dry food. Wet food would be 5lbs a week, but much more expensive of course ok thanks No problem good night! Good night! thanks