We have a 14 week old German Shar Pei and she has started something new these last few days. When we put her in the crate at night she immediately poops. This is after going outside numerous times prior. Additionally, after a few hours of sleep she does it again. She just started doing this (we rescued her 2 weeks ago). She only goes in the crate at bedtime. Is it nerves? How can we get her to not do this?