I looked out the window and what did I see?....

...It wasn't popcorn popping on the apricot tree like in the sweet Primary song. It was Sadie playing in her little pool that was almost empty and had the hose laying in it from when we filled it for her yesterday....You see we fill it up and she spends her time splashing it all back out (then rolling in the dirt when she is all wet...).  We turn on the hose with our foot because the hose bib is behind a bush.  It has this adorable metal bunny on it rather than the regular circle knob and it pretty easy to turn on just by tapping it down with your toe and then turning it off by putting your toe under it and lifting.  Apparently Sadie has seen us do it and turned it on herself.   I looked out the window (after letting her out 20 minutes before) and saw that the pool was over flowing and she was dancing around it happily....We have created a monster.  So, the question is how so we stop her from turning it on when ever she feels like it?  Any suggestions?