Here's an amazing story to start your Thursday ... the dog UFC legend Frank Shamrock abandoned in a parking lot has been adopted and has a new, loving home -- TMZ Sports has learned.
As we previously reported ... Shamrock tethered his mom's dog, Zelda, to a pickup truck at Dallas Love Field Airport last month because he says, "I had no other solution to solve that problem."
Frank says his mother was so sick, she could no longer take care of her dogs ... and when Frank couldn't find a home for Zelda, his plan was to leave the pet in an airport parking lot for security to find.