A small dog named Hatch drowned with the crew of the Mary Rose on July 19, 1545.
Now testing reveals that the dog had many characteristics similar to that of the modern Jack Russell Terrier -- and that the dog that was long thought to be female is, in fact, male.
It was thought the terrier was brought on board to rid the ship of rats, as well as to serve as a companion.
Hatch's remains went on display four years ago at the Mary Rose Museum in Portsmouth, England. The skeleton came up with the boat when it was brought to the surface of the Solent in 1982. The skeleton is nearly complete except for a few teeth and toe bones.