I had to drag it outside of his stall to scrub and hose it out, it was full of dirt, and then drag it back inside. How he did it with just his teeth is a mystery to me.
To fill it up, I shoved the hose down into the bottom and tried to walk away. Before I had even turned my back, Izzy had the hose in his mouth, shooting water everywhere. No matter how I positioned the hose, he managed to grab it from me.
I finally pulled the hose through the fence and simply let it spray into the trough. Even that was fun. For at least twenty minutes, he licked the water bubbles or let the hose splash him in the face.