It's certainly a form of anxiety. Its not separation anxiety, its not from abuse, she eats well unless it is raining, then she sleeps...
She gets attention, exercise, a playmate (well 4), and they never have shown signs of dislike to each other...even the cats sleep with her on occasion.
I have tried leaving her out on the long leash alone to see if she just wanted to potty in privacy since she only goes on the floor when we aren't around.
Another interesting thing: my malamute/wolf will literally wake up and puke with no warning...which isn't his fault and is normal with dogs.
The subject of the issue (Alli) will wake up, burp, make a weird puke face, then run to the kitchen and barf on the tile or if we are near she will hold it long enough to leash her and take her to the lawn to release. Now why won't she potty like that lol? Dawggggsssss