I have Shelby on a schedule. She goes out first thing in the morning when I get up. She then goes out right when I get home from work and then we usually go to the farm and she gets to run around or we go on a nice long walk. Then she goes out at about 9:30-10pm, just before bed. On days that I am off, I usually try to stick to the schedule when possible, but we are usually on the go and Shelby goes with me most of the time, so it is usually not a problem. If she needs to go outside of the schedule, she sits in front of me and whines. She has a specific whine for when she wants to go out vs. when she just wants attention.