My name is Clifford!

We found this good boy on a highway in rural TN. We have checked all over for his owners-called vets, shelters, talked to neighbors, posted online, checked for a microchip-with no luck. We have had him for almost a week, and although he is very sweet, we already have a dog and cannot keep him forever. He is very well mannered and friendly, although seems unfamiliar with home living. He occasionally tries to pee inside, and doesn't like to be crated. He seems unfamiliar with toys and treats, we assume he was an outdoor dog who didn't get much attention. He spends most of his time sleeping and following us around the house. He walks on a leash pretty well and enjoys going for jogs! He is very mellow and gets along great with our dog. We wanted to reach out before taking him to a shelter, as the only local one his a high-volume kill shelter.