They are offering a £200 reward to anyone who finds him.
Three-year-old feline Ronald, who is ginger and white and has distinctive features of a white belly and feet, was last seen in the CB7 5DJ area on April 25.
He is chipped and neutered, and his owner Conner Rogerson has said he doesn’t normally stray too far away from home.
“I’ve put posters up all over the town and posted notes through doors asking for people to check their sheds and garages,” he said.
“I’ve contacted all vets within a 30-mile radius and all of the cat protection agencies within my area.”
The family have also shared a poster with a photo of Ronald across social media groups and pages in the hope that someone out there has seen him or has some information for them.
Conner added: “He’s three years old and we rescued him when he was just a kitten from eight weeks old.
“Our two-year-old daughter is asking ‘where’s Buddy?’ which is her name for him [Ronald] whenever she looks out the back of our patio doors.
“He’s been missing since April 25 which is unlike him as he’s normally home every few hours for his meals and a fuss.”
If you have seen or heard anything about Ronald, please contact 07496892726.