It's not a horse's head. That's a wolf's head.
3 seconds sound clip from the The Wolf Man (1941) movie soundboard.
You can hear this line at 00:21:44.120 in the Blu-ray version of the movie.
Quote context
[...]
- It's the Gypsy who passed through town this afternoon.
- Was he killed by the same animal?
- No, his skull was crushed by heavy blows with a sharp instrument.
- So they are. Otherwise, he's fully dressed. Make a note of that, Twiddle.
- Oh! A stick with a horse's-head handle.
- It's not a horse's head. That's a wolf's head.
- Mr. Frank? Them tracks back there. A wolf!
- 'Found on scene of tragedy, silver-handled stick mounted with a wolf's head.'
- Let's have a look at those tracks.
- Larry. Shouldn't you be in your bed?
[...]