Is this really 'horror'?

Tough call - so many of Holmes's cases had enough bizarre elements to wander into the horror genre. And let's face it, the hound here is certainly frightening, the house and the moors are spooky... But no, I don't think of it as a horror film. And I'm fairly sure that no one with any sense really does, either. Most good mysteries, I think, have an element or two of horror about them, though.

It's a gothic horror mystery with Holmes on the case. The novel uses the term "horror" frequently to describe the effect the hound and the setting have on the main characters. And more than one literary critic have thought of the novel (and therefore, the film) as a rationalized werewolf tale.

Though the hound turns out not to be of spectral origin, the question as to it's nature, it's howling in the distance, it's stalking of some of the main characters and murder of them - all point to the film having significant horror elements.

"For that day."
-Three Days of the Condor

The hound looks pretty horror-ible to me when it attacks the Housekeeper's deranged brother and knocks him off the cliff, causing his death. I am surprided though, that it is in the top 50. Regards, mustangp51b

Most all other versions of 'The Hound of the Baskervilles' also have the horror category attached to them. Other Sherlock Holmes stories on screen are not generally seen to be in this genre. One notable exception to this is 'The Masks of Death' (1984), with Peter Cushing as Holmes, which is more of a horror story than 'The Hound of the Baskervilles.'

I wouldn't consider it horror, more of a mystery/drama.