What specific type of dog is Snoopy?

Snoopy's first appearance was in 1950. As of 2015, Snoopy was 65 years old.

His actual age in the strip is never delineated, but would be between in the range between 3 and 10 years, given the average lifespan of 12 to 15 years for beagles. According to a 1972 movie (Snoopy Come Home!), Charlie Brown was not Snoopy's first owner. And he is older than Charlie Brown's sister Sally (born 1959).