No, it is not. It is the past tense and past participle of the verb to dock, and may be used as an adjective. There is no adverb form.
parked (i docked the boat)
I docked for a few days.
Field Spaniels tails are usually docked, especially if they are used for work. The Breed Standard does not stipulate how much of the tail should be docked, but it is usually docked at around the second joint.
Boxers tails are shown to be docked on bullenboxers.webs.com.
The USS Constitution is docked in Boston, Massachusetts
of Dock
docked
Example sentence - We will make sure our boat is securely docked for the night before we leave.
It is currently docked in San Diego Bay - just saw it today
The dogo's tail doesn't need to be docked and a docked tail is a disqualifier in competition.
The puppy will need to be less than four days old to be docked.
a naval American