Meeko is a dog in Skyrim
Location
Meeko lives in Meeko's Shack West of Morthal and South of Solitude
How to get as follower
Find Meeko in the Shack. His owner is dead so you can tell Meeko to follow you.
Hearthfire DLC
Meeko is also one of the Pets your kids can adopt in Skyrim: Hearthfire