That is toooo funny!! Methinks that Toby isn't very fond of your boyfriend!!
My son has a Border Collie [Missy] that is more spoiled than Toto and is soooo jealous ... it's a wonder she isn't green!!! Toto senses her hostility, I guess, and every chance she gets, she gets Missy's favorite Frisbee ... climbs over in it and pees!!!
It has to be a revenge thing!! One thing for certain ... I wouldn't want to be on the receiving end of a Yorkie's revenge!!!