I have a friend that has a 5 month old lab, and he "dribbles". She said that when he goes outside to pee, it all comes out in one stream and everything is fine. Inside she is constantly finding these trails of pee. Always a very small amount, and always in a trail like he didn't stop moving. It is never in a puddle in the house. She has taken him to the vet, and they can't find anything wrong with him. Has anyone experienced anything similar, or have any ideas?