On the extraordinarily loudly purring Merlin, Guinness World Records spokesperson told The Dodo:
Here at Guinness World Records we enjoy coming across your typical everyday pet with a rather unique talent and Merlin the Cat from Torquay is just that. It was amazing to see just how loud his purr was in person and, despite a couple of readings of Merlin's purr just under the current record, a bowl of tuna cat food proved to make all the difference and secure the record.
Most cats purr at around 25 decibels, but Merlin clocks in at 67.8! He has reached volumes as high as 100, according to Tracy Westwood, who rescued Merlin as a kitten from a shelter in the U.K., and can hear her beloved pet purring even when she's using a hairdryer. The previous world record was held by Smokey, who registered 67.7 decibels.
Just listen to the archives of the new champion of purring: