A cant hook is a traditional logging tool consisting of a wooden lever handle with a movable metal hook called a dog at one end, used for handling and turning logs and cants, especially in sawmills. Unlike the similar peavey, the cant hook has a blunt tip, often bearing teeth.
Cant hook Wikipedia
A logging tool description from the Lumberman's Museum at Patten, Maine, reads in part: "A cant dog or cant hook was used for lifting, turning, and prying logs when loading sleds and on the drive. At first, a swivel hook on a pole with nothing to hold it in position was used. This was called a swing dingle." However, the term swing dingle is more often published as being a type of logging sled. These early types are also called a ring dog or ring dog cant hook. In 1858, Joseph Peavey, a blacksmith in Stillwater, Maine, made a rigid clasp to encircle the cant dog handle with the hook on one side. It moved up and down, but not sideways. All loggers have used it ever since."
While this tool has its origins in the logging industry, many arborists, tree care professionals, land owners and portable sawmill operators now use cant hooks for moving logs and timber.