Every so often I get a note from someone asking me about the Peanuts comic strip in which Snoopy appears as a Beagle Scout or as the scoutmaster of a troop of Woodstock’s friends. I never had a collection of all the comic strips, but today I found a couple of sources that will help you to find them all.
The first is http://peanuts.wikia.com, a site that answers all your questions about Charlie Brown and his gang. It is where I started looking for the comics featuring Snoopy, the Beagle Scout. (Who, by the way, started his Scouting as a Tenderpaw.)
The second site you will need is comics.com. I will save you the trouble of looking for the first strip and give you the address. http://comics.com/peanuts/1974-05-13/
Between these two sites I was able to find over 35 strips dealing with the Beagle Scout and his troop. In one of the last strips he attends a wedding of a couple of the troop members and becomes the groom’s First Beagle. Have fun reading through them all.