I wouldn't do that to a dog.
4 seconds sound clip from the Ruggles of Red Gap (1935) movie soundboard.
You can hear this line at 00:15:31 in the Blu-ray version of the movie.
Quote context
[...]
- It took me 20 years to build up this moustache and I ain't gonna have nobody monkey with it now.
- I wouldn't do that to a dog.
- How do you like it, monsieur?
- Well, I don't know. Let me see. How would you like it?
- I'm going home. I'm gonna find myself a closet so that I can hide in it.
[...]