Bench dog

A bench dog is a removable clamp used on a woodworking workbench to hold an item fast while being worked.

It is characteristically used in concert with an adjustable dog on a bench vise, allowing an item compressed between the two to be held fast on each end, and if offset in both directions.

Dog holes are arranged in a line perpendicular to the jaws of a vise, typically in intervals of four to six inches.

Some workbenches have a second row parallel to the vise jaws, to allow broad or long items to be held fast in two directions, as well as to the benchtop itself when using one or more holdfasts.

Some woodworkers use round dogs which have been flattened on their rear to bear in square holes.

Two metal and one plastic bench dog
A woodworker's tail vise with its dog extended, holding (without using the dog) a wooden bench dog being worked
A bench dog in use. Notice that the dog can be lowered below the edge of the item being worked to keep clear of an action such as planing