Oh, bother.
1 seconds sound clip from The New Adventures of Winnie the Pooh - A Pooh Day Afternoon (S4E3).
You can hear this line at 00:08:01.303 in the Blu-ray version of the episode.
Quote context
[...]
- Why don't you take a nap, say, till your owners get home?
- Let me try to reason with him.
- Well, he's a sheep dog, isn't he?
- Pooh, make that sound again.
- I don't know how I made it the first time.
- I think we just solved our dog-sitting problem.
- Fetch!
[...]