The creature has to be taken alive.
2 seconds sound clip from the 20 Million Miles to Earth (1957) movie soundboard.
You can hear this line at 00:41:30.806 in the Blu-ray version of the movie.
Quote context
[...]
- Well, looks as though my patient has fully recovered.
- Don't move. Stay where you are. Let's back out quietly.
- The creature has to be taken alive.
- There's a cart outside. Would you have your men bring it in the barn?
- Now will you get me a long wooden pole?
- I've had nightmares in my time, but I've never dreamed of anything like this.
- Actually, they're not ferocious unless they're provoked. That poor dog must've jumped him first.
[...]