Transcript:
Patty and Violet are walking down the lane. Patty says,"I wouldn't want to own just any kind of dog"
As they walk across the bridge, Violet says,"Oh, no, me neither....I'd want one that was very intelligent looking"
Patty points in front of her and asks,"Do you mean like that one?"
They watch as Snoopy walks by wearing glasses. Violet replies,"Yes, that's the kind...doesn't he look intelligent?"
Original comic:
Good catch. I'm surprised the wiki doesn't mention this as the first time Snoopy wears glasses. It tracks a lot of little trivia like that.