My dog stays home 9+ hours a day by himself during the week, without going out. A previous dog, was paper trained to go on newspaper spread out in the corner of our basement, and we left the basement door opened so she cold go as needed. We've left her home by herself for overnight before, with plenty of food and water, and access to the basement. All of my dogs have been trained to "self-eat," they never eat all their food at once. I've only had mid size to larger dogs. They've also been crate trained, so they love their crates, it's their own little den.