Catching dognappers is our business, Mr. Masters.
3 seconds sound clip from Scooby-Doo, Where Are You! - Decoy for a Dognapper (S1E5).
You can hear this line at 00:20:18.403 in the Blu-ray version of the episode.
Quote context
[...]
- Hey, Shaggy! Come on! Follow the dogs!
- They've spotted him! The dogs have him!
- Why, it's Buck Masters, the owner of Big Red! He's the dognapper!
- You blasted kids! Why didn't you mind your own business?
- Catching dognappers is our business, Mr. Masters.
- After all, Scooby-Doo is a dog, and we love him very much.
- Aww!
- He decided to win the dog show by dognapping the only three dogs who could beat Big Red.
- Then Big Red was to turn up just before the show and win first prize.
- You said something about a phantom Indian on horseback. What about that?
- Simple. He used a movie projector from the back of his truck.
[...]