Cat.

Our neighbors have a cat who is a complete asshole.  Whenever Toby goes outside for a walk or to go potty, that damn cat bugs him.  He is an asshole.  It's the only word I can come up with to describe him.  I hate that cat!  Poor Toby is working on his training and out of nowhere, we can hear the tinkling of a tiny little bell.  The asshole cat is sneaking up to bother Toby.  Even tonight, at "late thirty" I took him out to do his business, and the cat came running from the very end of the street just to distract him.  I don't wish the cat any harm, but it's hard to not just let him off his leash to chase it.  Grrrr.