Because dogs are a shark's natural prey.
As you can see, the experts have been full of it for a long time.
Bull shark.
They can adapt to nearly fresh water.
Crap attitudes too.
We’ve known this forever
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NEW JERSEY SHARK ATTACKS OF 1916
In July of 1916, New Jersey became the site of a series of vicious shark attacks that would span 12 days and take the lives of four people and severely injuring one. “With previous deadly attacks in Beach Haven (Charles Epting Vansant, July 1st, 1916) and Spring Lake (Charles Bruder, July 6th, 1916) the shark made its way north and down a freshwater creek in Matawan, New Jersey on July 12, where it would attack and kill 12-year-old Lester Stillwell and 24-year-old Stanley Fisher within an hour of each other. The suspected man-eater would be caught two days later in the nearby Raritan Bay. To be sure it was the killer, the over 300 pound monster was dissected, and 15 pounds of human remains were found in its stomach.” While this has been the legendary tale, the attacks were most likely made by multiple sharks. The attacks in Matawan Creek have been accepted to be that of a Bull Shark, the only shark that can survive in both fresh and saltwater. The incident was heavy inspiration for Peter Benchley, who would write his 1974 novel Jaws set on nearby Long Island.