I don't usually leave my dogs alone for longer than 3 hours at a time however I've had a breakdown 3 hours drive from home and am stuck in the middle of nowhere waiting for the recovery truck. I let them out at 8.30am, and he's not going to get back until 4.30pmish. So that is 8 hours they'll have been stuck inside. Google isn't helping me! I feel awful, I really hope they'll be okay. Lots of cuddles when I get in.