What's Down There ?

Every day when we walk Otis, he stops and peers into this snow hole.  There is a run off grate at the bottom of the hole. Otis seems fascinated by the running water.

One of our neighbors has a stream in his yard. On rainy days, Otis likes to stop and stare at the rushing water.  I think Otis might dive in if he wasn't on a leash.