Definitely not a zebra's tail.
3 seconds sound clip from The New Adventures of Winnie the Pooh - King of the Beasties / The Rats Who Came to Dinner (S1E17).
You can hear this line at 00:02:01.480 in the Blu-ray version of the TV Series.
Quote context
[...]
- Hoo. There's my noble cousin the eagle.
- What about me, Christopher Robin?
- Hate to be the one to tell you, Tigger, but you're not related to zebras.
- Why, we're first cousins. Just look at these stripes.
- Don't see how you can be with a tail like that. Far too long.
- Definitely not a zebra's tail.
- I'm not related to... to nobody.
- Well, Tigger, well, you're sort of related to a... to...
- To him?
- I'm related to this lion, isn't I, Christopher Robin?
- Well, I guess you are, sort of.
- And the lion's king of the beasts.
- King of the beasties? I got royal blood. I'm a king!
[...]