Dog rescued from frozen Michigan Harbor

CHICAGO—A dog caused some big problems on one of the coldest days of the year in Chicago.

A good Samaritan spotted the dog, trapped on a frozen lake in Michigan Harbor.

The man noticed the pup was having trouble making it back to solid ground and called authorities.

A Marine Unit diver crawled on his stomach to reach the dog.

When they finally connected, the dog was given a tranquilizer to calm it down and make it easier to handle.

Officials say the pooch should be alright and was taken to a shelter in order to see if he has a micro-chip or other identifying information.