Dog the Bounty Hunter is right on Brian Laundrie’s tail … or at least it’s possible, and authorities are looking into it.

A source with direct knowledge Dog — who joined the manhunt for Gabby Petito’s fiance a couple days ago — has been in the Florida woods looking for him, and found something he thinks may finally lead to his capture.

We’re told Dog got a tip that led him and his new wife Francie to a fresh campsite that might be linked to Laundrie … who’s been missing for a week and a half now.

Our source says Dog has alerted authorities to the campground location because he believes it could be a major clue in the manhunt, and he’s currently waiting for their arrival.

There’s more — we’re told Dog believes he’s also uncovered proof that links Laundrie’s parents to the campsite … though it’s unclear what that is.

Of course, this could also be a false alarm — just like the trail cam footage and the look-alike sighting in Canada — but we’ll have to wait and see.

As you know … Gabby was found dead in a Wyoming state park a little over a week ago, and the feds have issued an arrest warrant for Brian for unauthorized use of a credit card right around the time Gabby went missing.

Gabby’s family held a funeral for her this weekend in New York.