Though Sir Arthur Conan Doyle's story The Hound of the Baskervilles is centered around a great spectral hound, which we "hear" just. Prior to Mr. Holmes and Dr. Watson's visits to the Baskervilles estate, there have been rumors of a demon dog who hunts the family as part of an ancient curse. Some people say that they hear the dog on the moors during the night. The beast is described as being a massive, dark dog, with flames glowing from its eyes and mouth. Its call is described as beginning like a low grumble, swelling into a mournful howl, and dying away again in a moan.
In the ninth chapter--Second Report of Dr. Watson-- we find Dr. Watson and Sir Henry Baskervilles on the moor late at night. The butler, Mr. Barrymore, has gone out to take food to his escaped convict brother-in-law, Selden. Watson and Sir Henry fear that Mr. Barrymore is at risk of harm, as Selden was sentenced to imprisonment for a violent murder. While they are searching, they hear the terrible groaning howl of a hound-- the very beast that killed Sir Henry's uncle. Though the dog is encountered in-person later in the twelfth chapter, we never hear its call again.