I walk the dog every morning. That, or she has a play date with a neighbor dog. Though she doesn't always show it, Sammy has a ton of energy, as most Aussies do. While I was in NYC, she sat in the backyard alone for three days straight, and I am pretty sure she was only walked one of those evenings, leaving her with bounds of energy each day.
This is what I came home to:
We learned our lesson. She must be walked at the beginning of every day.