A puppy escaped from his collar in New York City. He swam across the Hudson River and ended up in New Jersey.

A service dog from New York City got loose and took a long solo journey – swimming across the Hudson River and ending up in New Jersey. Bear the service dog got out of his collar when something spooked him on Saturday. He ran 30 blocks and jumped in the river that sits between New York and northern New Jersey.

"The story just seems so insane to me that I cannot believe it's true," Bear's owner, Ellen Wolpin, told Inside Edition. Wolpin got Bear just last week as a service dog for her son, who has seizures. 

The Hudson River is about a mile wide, and while that swim may be difficult for humans, Bear is a mix of a Bernese mountain dog and Leonberger and a natural swimmer, according to Inside Edition.