Cool idea, I had mine fight too!
Unfortunately mine didn't make it past round 2, it was the green one and seemed like it attacked itself (like a lightning shock attack) sometimes.
The food dispenser's click area could be a button on top or something so it doesn't absorb the clicks you meant for the dumbell or to fling the rascal.
My favorite part was the audio, very satisfying SFX and great change in music between training and fighting!
Good work!