Our black cat, Rosie, has the quietest purr known to felinehood, a barely-perceptible, hushed hum of happiness. When I am petting him, sometimes I gently rest my head on his body to check if he is purring. Without being that close to him, I would never be able to hear him.
One day, Dove, who is 6, came up to me and rested her head on my chest. I thought she was affectionately snuggling with me, but then she lifted her head and informed me, “I was checking to see if you are purring.”
Since I was not, in fact, purring, she gave me a look of slight disappointment and even disapproval, then went off in search of the cat, who was likely to offer up far more satisfactory results in the purring department.