Personally, I dont believe dogs think "screw you" when they do things like this....they are much too simple and pure to be so devious and "plan revenge." They just do what feels good, what they see as in their best interest.
They do commonly suffer from seperation anxiety, however, which can explain some behavior such as destructiveness and housesoiling that only occurs when left alone. Dogs also love pee and poop.... they are fascinated w/ it.....they wouldnt see it as an insult or a mess like we do! They use it to mark their property. You and your bed are her valued property and perhaps she wants everyone to know it! Vilma Briggs Mt. Gilead, OH U-UD Mocha Java Slurp, UDX, HIC, TT Ch. Brighteye Expresso Bean, UD, NDD, TT U-CDX Our Little Buddy, UD, NA, TT and rescue Berners: Charm (Thirdtym's A Charm CGC) and Willow
