Ermest Hemingway's Six Toed Cat

Here is something I gleaned from the net this morning. Because Ernest Hemingway was impressed and captivated by a friends poly-dactyl cat, it all started with a cat named Snowball. He was given a six-toed cat from a sea captain named Stanley Dexter . Today some of the cats who live at the Hemingway Home and Museum are descendants of that original cat.

There are variations to that online data, as another claims that a sea captain gave Hemingway a female, double pawed cat that was named Princess.

Sailors believed that six-toed cats were lucky. Cats arrived on Key West in the early 19th century in the company of sailors looking for sunken treasure.

Is any of this information true facts? As stated I gleaned it off the net, so I don't know?