Dolphin part fell off in the night...

by Amanda
(Ohio)

We are caring for our neighbor’s pool while they are gone for a few days. They told us to leave the dolphin in the pool and don’t take it out as it is on a timer. They said to not take it out or we would have to clean the filter. We left at 6pm and at 6am we came to find it apart in the pool. Does this easily happen? How do we fix it? Should we be concerned that somebody tampered in the night?