Snoopy is a loyal, imaginative and good-natured beagle who is prone to imagining fantasy lives, including being an author, a college student known as "Joe Cool", an attorney and a British World War I flying ace. He is perhaps best known as this last persona, wearing an aviator's helmet and goggles and a scarf while carrying a swagger stick .
Snoopy can be selfish, gluttonous and lazy at times, and occasionally mocks his owner, Charlie Brown. But on the whole, he shows great love, care, and loyalty for his owner even though he cannot even remember his name and always refers to him as "The Round-Headed Kid". In the 1990s comic strips, he is obsessed with cookies, particularly the chocolate-chip variety. All of his fantasies have a similar formula. Snoopy pretends to be someone (usually world famous) and fails. His short novels are never published.
Snoopy imagines himself being able to speak, but never actually does, other than nonverbal sounds and occasionally uttering "Woof". His very articulate thoughts are shown in thought balloons. In the animated Peanuts films and television specials, Snoopy's thoughts are not verbalized. His moods are instead conveyed through moans, yelps, growls, sobs, laughter, and monosyllabic utterances such as "bleah" or "hey" as well as through pantomime.