noun. A pooch who slobbers ectoplasm! Booooooo! Arf-arf! Barf!
Real citation: “I think you might have a polterdog...They are similar to poltergiests, you know take things, move things around-but polterdogs also chew things up--i would look into polterdogs before blaming an innocent pup!...”
(Oct. 1, 2006. Dogster Forums, http://www.dogster.com/forums/Behavior_and_Training/thread/351465)
Made-up citation: "Could my dog's inexplicable bow-wowing be directed at an invisible, sinister polterdog? Oh, it's just his reflection in the window. Doh! "