4 Feline House.....Thank you so much for the note which covered so many aspects to this issue! It certainly helps me understand what makes a cat "tick" a little better.

I know that stress played a part in my sister-in-law's kitties' litterbox problems when they first got their german shepherd puppy. They were actually afraid to go downstairs to their litter box location for fear of running into the dog. They added a second litterbox upstairs and over time, as the cats have learned that she was not an enemy ready to gobble them up, they have stopped their inappropriate peeing.

I know we have gotten away from Casmeow's original question, but in the meantime I think this topic has turned into a very informative one and has probably helped others as well as me!