Tracy Westwood, 47, with her cat Merlin the loudest purring cat in the world. See SWNS story SWPURR: A British moggy with a purr as loud as a lion's ROAR has broken the record for the world's nosiest CAT. Merlin has been recognised by Guinness for her deafening meows that have been recorded at around 100 decibels - FOUR times louder than the average feline. Owner Tracy Westwood suspected Merlin was a record breaker but official testers confirmed this during a visit to her home in Torquay, Devon. The previous official record for a cat's purr was set in 2011 with a 67.68dB rating by Smokey, from Pitsford, Northampton.