You can get something for Nothing ! I feed my 2 Bull terriers in the Backyard, ( North)and My Daughters 2 Rottweilers in the Front.( South) I feed them out of 25kg bags, I also pick up the Dog Poo in a scoop and put it back into empty Food bags. Question is :- How come I end up with more than the bag originally held in food? Is the Shape of the Earth effecting this? Also if North and South were ever to meet, the Dog Food bills would drastically decrease!