Donald Dock is the wooden dock across from The Dispatcher, and also happens to be his best friend. He is special because he only uses the words "uh-huh" and nothing else. The Dispatcher and the tugs sometimes go to him for advice and usually get the right answers from him.
- Season 1 - Theodore and the Oil Rig (cameo), Foduck the Vigilant (cameo), True Blue Friends (cameo), Bumper Buddies (cameo), The Day Ice Came to the Harbour (does not speak), Theodore's Bad Dreams (cameo), George Buzzes the Dock (does not speak), and The Great Harbour Clean Up Contest (cameo)
- Season 2 - Theodore Changes Sides (cameo), The Cold Snap (cameo), Carla the Cool Cabin Cruiser (cameo), Snorri the Viking Ship (cameo), Foduck Stays Home (cameo), Theodore the Jokester (cameo), and Theodore's Day Off
- Season 3 - A Joke Too Far, Hank's Hiccups, Hank's New Name (cameo), Big Harbour Birthday, Theodore's Backwards Day (cameo), Emily's New Hat (cameo) and Theodore and the Missing Barge (cameo)
- Season 4 - Hank Makes a Friend
- Season 5 - Hank Hurts a Ship (cameo), Hank and the Sunken Ship, George and the Flags (cameo), and Theodore's Bright Night (cameo)
- His name is a pun on Donald Duck.
- His model is currently on display at the Maritime Museum of the Atlantic.
- In the Finnish version of A Joke Too Far, Donald Dock is called Aku Laituri.
- ERTL (discontinued)