He's Your Dog, Charlie Brown

Patty:
[Snoopy's flying WWI flying ace and hiding watching the girls] After the show, we'll stop and get a hot-fudge sundae, okay?

Violet:
Okay, fine.

Snoopy:
[jumps out behind them] Bang! Bang!

Lucy van Pelt:
Charlie Brown, you've got to do something about that dog.

Linus Van Pelt:
It's up to you, Charlie Brown.

Charlie Brown:
Why me?

All kids:
Because HE'S YOUR DOG, CHARLIE BROWN!

Lucy van Pelt:
If that stupid dog doesn't come home pretty soon... I'm gonna start missing him.

All kids:
SNOOPY COME HOME!

Patricia "Peppermint Patty" Reichardt:
[about Snoopy, who's freeloading at her house in his flying ace gear] You almost get the idea that he thinks he's a soldier on leave in Paris.

Patricia "Peppermint Patty" Reichardt:
[entering a kitchen where the sink and counter are full of dirty dishes] He's only been here a week, and I'm beginning to see why nobody's missed him.