Hamling has become an important player for the Bulldogs this season, playing 10 games in the absence of defenders Bob Murphy and Marcus Adams.
However, the 23-year-old is likely to lose his spot in the side when the pair return from injury in 2017.
The Dockers are targeting a raft of West Australians this trade period, as they prepare to set the club up for a the future.
Hamling spent three seasons at the Cats, but was unable to break into the senior side, failing to play a match, before finding his way to the Bulldogs as a delisted free agent in 2014.
He is believed to prefer to remain at the kennel, however, Fairfax reports that he is open to considering a move back to his home state on what would be a substantially better deal than his current contract.