I have a 1-year-old spayed Chihuahua that cannot go to the bathroom outside because it gets too cold for her in the winter. We have a tray that she is supposed to go to the bathroom in and it is in her small enclosed pen. Whenever we let her roam around (with the pen open so that she could access the tray), she goes on the floor. I've tried reprimanding her, but it doesn't work. She just feels guilty, but then does the same later on. I feel like she may be afraid of the pen because it's where we keep her when we're away, but we need something to contain her in. Can anyone help me stop Chloe from peeing on the floor? I don't want to have to give her away, she means too much to me.