Oh my bf does this kind of stuff too...
One day he left his roast beef sandwich right on the table, which was pushed up close to the couch...completely open...on the plate, while he went in the other room to do something.
When he came back all that was left was the bun and lots of ketchup smears all over the suede couch....
I heard him yelling from the other room and came running...but when I saw what had happened all I could do was laugh...hahaha. He got so mad at me but I've explained to him hundreds of times that if the dogs can reach it...they're going to steal it...lol.
He has also tried to give them chips...and all that mess...and when they make a horrible mess he gets mad at them! They're so ridiculous sometimes...