I won the first battle - deciding to keep Sammy in the basement to keep her off the couch. The decision was reinforced because I recently got new pillows for the couch.
She won the second battle hands down with guerrilla warfare. Fiance came home to find diarrhea all over the basement floor AND for good measure, she tore up one of the old couch pillows as if to say "Not only will I have my vengeance but I will spread the feathers of the dead pillow in poop to show my power".
While the war wages on, I am confident that opposable thumbs and brain power will win over disgust and brut strength. In the meantime, I will spend the weekend trying to rebuild my fortress with a steam cleaner!