But at the end of last month, Billy and Noah's Ark were met with an unexpected surprise.
A new client - a father and daughter - visited the hospital. As Billy walked by, the father commented that the cat looked an awful lot like the one their family had lost years ago. His name was Batuffolo, known as Tuffo for short. As the man and his daughter continued to speak with the receptionist, Billy suddenly did something very out of character.
"Billy recognized them and jumped up on the very top of the counter, which he doesn't do," Keyes said. "Then, he jumped right into their arms. Billy lets people pet him, but he never jumped into anybody's arms."