I have a dog.
Any parent will tell you the best part of having a dog is the instant clean-up of all food products from the floor. I have been known to dump the contents of The Boy's booster seat onto the floor at a friend's house only to be reminded by their confused looks that they, in fact, do not have a dog.
The other day a friend of mine was over and we were sitting and talking like adults in the living room. I found a piece of cereal on the cushion beside me and threw it into the kitchen. Admittedly this is border line behavior even with a dog, but when the dog doesn't move and so effectively all you have done is thrown a piece of trash from one room into the other... suddenly you cross the very fine line into 'trashy'.