Hmmm...I don't know. Recommended feeding is four to five cups for her size. I think the can holds less than that. Large kibble that is. Anyway, the whole point of my and other's posts is these large breed dogs are not big consumers of feed as believed by many. They are not high energy requirement types or even large volume requirements compared next to breeds half their size.
And dogs with a territorial protective instinct would not work in my area. Can't have a dog with that kind of strong sense of territory attacking my neighbors and their dogs as they pass by on the public road. Barbed wire is about the best we can do on fencing and that doesn't work on anything other than cows or horses, so a LGD was my best option if I wanted to free range my birds. It has worked well. Mine doesn't wander, unlike others report at times. I did something right!
Interesting. LGD's are well known for the roaming tendency when kept on small acreages.
She's still a puppy, though, so even though she's well aware of her boundaries, if she sees something interesting on the other side she HAS to investigate! I have an invisible fence for her and since getting the "stubborn dog" collar and widening the boundary width she no longer dares cross. Instead, she watches the passersby go by, barking, and when they're clearly gone, she will go back to one of her posts. She doesn't mind entertaining neighbour dogs that come on the property, but then again none of the ones that have visited were among the local chicken-killers. One of those (chicken killers) she met once off-property when we were going to the beach and she did NOT like her! Their sense of "knowing" is certainly a wonder 
