Disgruntled

Desperation struck and I sneakily hid his ball under the misapprehension that it would be a case of 'out of sight out of mind'... as you can see from his expression The Zigster is less than impressed and not to be fooled!

You can fool some of the people dogs all of the time, and all of the people dogs some of the time, but you cannot fool all of the people The Zigster all of the time.
Phineas T. Barnum