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Murr (plural: murrs; uncountable: murring), though commonly misconstrued as being a sound for all animals, is a canine version of a cat's purr. It is the growling, half-moan that canines make when being scratched or played with.
It is often used - by furs of many species, including Humans - in role play as a sound of sexual pleasure, but the murr can be derived from any sense of pleasure, from scritches to gentle stomach rubbings.