If you’ve lost a pet, you have likely encountered “Rainbow Bridge”—a simple but poignant poem about animal heaven and the promise of reunion with furry loved ones. When Koudounaris finally reached Clyne-Rekhy in January and asked if she was the author of “Rainbow Bridge,” her first response, she says, was “How on Earth did you find me!?’”detailed earlier this month, began in 1959. ”As for Clyne-Rekhy, she says she already has concrete plans to be reunited with Major and her subsequent pets, whose ashes she has kept