Jensen is a werecat and Jared is a werewolf. Jensen was lost in the woods and unintentionally came across alpha Jared's territory who thought Jensen was trying to challenge him. Jensen was scared of Jared and in protecting himself shift into his cat form that is actually kind of a house cat and hide under his car.

Jared was living alone in the woods because he was kicked out of his pack because he was gay. Ring any bell?