Ah-ha. I thought so. You see? It's filled with dog germs.

7 seconds sound clip from the Happy New Year, Charlie Brown! movie soundboard.

You can hear this line at 00:18:00.480 in the VHS version of the movie.

Quote context

[...]

- I'm going to be strong and firm.

- Forget it, Charlie Brown. You'll always be wishy-washy.

- Why can't I change just a little bit? I've got it. I'll be wishy one day and washy the next.

- Charlie Brown, I have news for you. You will never...

- You sniffed in my root beer! Your stupid beagle sniffed in my root beer! Look at that. I'll bet it's full of dog germs! Where are my binoculars?

- Ah-ha. I thought so. You see? It's filled with dog germs.

- There's one thing you should never do: Never sniff at someone's root beer.

- Hey, Chuck, wait for me.

- Hey, Chuck, that was a sly move on your part. You know, to get us out here alone on New Year's Eve.

- Huh?

- Yep, we might end up ushering in the new year together.

- I bet you'd like that, eh, Chuck?

[...]