There are many reasons for separation anxiety, and only a thorough investigation of the dog's background in its home environment will pinpoint the exact cause. (dogtrainingminneapolis-mn.com)
The only reason for separation then was because they were moving around and waking each other up. (babycenter.com)
All animals will be returned to the shelter at the same time unless there is a medical reason for separation. (whitmanpets.org)