A big pet peeve of mine:

If you are walking your dog and he does “his business,” and you pick it up with a doggy waste bag, HOLD IT UNTIL YOU GET HOME!!  My trash can, just that morning emptied by our Department of Sanitation and not yet brought back into my yard, IS NOT THERE FOR YOUR CONVENIENCE!!  By dropping it into my trash can, you are exhibiting selfish, irresponsible, inconsiderate and lazy behavior.  If carrying your dog’s bag of poop so offends you that you can’t wait a block or two to drop it in YOUR OWN TRASH RECEPTACLE, you don’t deserve to have a dog share your life.  Take responsibility – I no longer want to deal with your poop!