Great Pumpkin followed the next year, and A Charlie Brown Thanksgiving came in 1973. But why Snoopy, and why is he so big now? Roy Schwartz, a pop culture historian and journalist, tells PEOPLE in ...

Snoopy, the beloved beagle dog from the Peanuts ... and his participation in special events like the Macy’s Thanksgiving Day Parade ensure that his legacy endures over time.