Well, it's a good idea, except for the gun. The colors are really dead, probably because of this flash, which is really distracting with this reflection at this metal door. And i hope this doesn't sound like a offense, but the dog is a better actor then the guy, who really looks sleepy. I think you had a good idea, it needs some adjustments at the composition to make it look more real. Sorry if i was rude.
The culprit doesn't look very concerned... actually looks kinda indifferent... and the dog looks more like it's pleading with the person than attacking... overall this image is more innocent I think...
Flash reflecting off the back, shadow behind subjects, cutting off the gun with the top of the frame, dull colors... More attention to details would make this work better... as is, it feels very snapshot-ish.
Hehehe.. Well, where to start. Neat idea. Technically pretty good. Looks very staged. Very harsh light on the left which keeps guiding my eye to that spot instead of your subjects.. Oh, and it's 'break'. :)