Most cats purr at around 25 decibels but Smokey's averages 80 decibels.
However, when measured close-up her purrs reach 92 decibels, equivalent to the noise of a lawnmower, hair dryer or, it is claimed, a Boeing 737 coming in to land.
Its owners, Ruth and Mark Adams, say Smokey's deafening purrs make it impossible for them to hear the television or radio when she is in the room and they struggle to have telephone conversations.
"She has always been very vocal and purrs at some level nearly all the time," said Ruth, from Pitsford, in Northampton. She even manages to purr while she eats. The only time she is quiet is when she is asleep. When I'm on the phone friends often ask what the loud noise is and they can't believe it is coming from a cat."