Characters

Charlie Brown Main article: Charlie Brown Despite his history of conflicted loyalties, his constant disrespect for Charlie Brown, and his inability to remember his name (he refers to him as "that round-headed kid"), Snoopy has shown both love and loyalty to his owner. Charlie Brown would often get irritated at Snoopy's flights of fancy with the comment, "Why can't I have a normal dog like everyone else?" He joins Charlie Brown in walking out of a game of Ha-Ha Herman when Peppermint Patty insults Charlie Brown, unaware that Charlie Brown is within earshot. He also helps Charlie Brown recover his autographed baseball when a bully takes it and challenges Charlie Brown to fight him for it. When Charlie Brown has to stop dedicating himself to making Snoopy happy, Snoopy replies, "Don't worry about it. I was already happy." In The Peanuts Movie, Snoopy remains loyal to Charlie Brown, supporting and caring for him throughout the movie. In early Peanuts strips, Charlie Brown was not Snoopy's owner (as seen in the February 2, 1951, strip), and it was not made clear who, if anyone, his actual owner was. At various times, it was suggested that he was Patty's[20] or Shermy's dog. Charlie Brown was first portrayed as being responsible for Snoopy in the strips of November 1 and 3, 1955; it was not until September 1, 1958, that Snoopy was specifically said to be Charlie Brown's dog. (In the September 20, 1980, strip, Charlie Brown comments that he once told Snoopy to "stay" and "he never went home.") In both the early strips and the movie Snoopy Come Home, Charlie Brown says that he got Snoopy after being bullied by another kid. His parents took him to the Daisy Hill Puppy Farm to cheer him up, where he met and bought Snoopy. The special Snoopy's Reunion depicts their first meeting.

Lucy Main article: Lucy van Pelt Snoopy frequently tries to kiss Lucy on the cheek or nose, which Lucy, who is afraid of dog germs, thoroughly hates. Despite her distaste of doggy kisses, Lucy seems to care for Snoopy: in Snoopy Come Home, Lucy is sad to see him go and is (momentarily) glad when he comes back home. In some strips, Lucy goes to Snoopy for help, such as in the April 16, 1961[22] strip, wherein a jealous Lucy and Frieda are beating each other up at Schroeder's piano, Lucy ends up winning, and shakes hands with Snoopy in the end, looking slightly injured. Snoopy also commandeers Lucy's psychiatric booth either in her absence or when she ends up being the one needing help. In Snoopy!, Lucy and Snoopy hug each other during the song "If Just One Person".

Linus Main article: Linus van Pelt Snoopy often tries to steal Linus's blanket, leading to slapstick fights and wild chases, the latter of which usually involve Snoopy running up, grabbing the blanket in his mouth, then running off with Linus holding on for dear life, and finally swinging Linus and the blanket around and around in a circular motion through the air before letting go and they both fly off to who-knows-where.

Lila Lila was Snoopy's owner before Charlie Brown. Snoopy visits her in the cartoon Snoopy Come Home and struggles to decide whether to stay with Charlie Brown or go back to Lila. Lila quickly persuades him to leave Charlie Brown so Snoopy can live with her again. However, upon arriving at her apartment complex, Snoopy is very relieved to see a "NO DOGS ALLOWED" sign and returns to live with Charlie Brown.

Peppermint Patty Main article: Peppermint Patty Peppermint Patty often refers to Snoopy as a "funny-looking kid with a big nose", unaware that he is a beagle. In one instance, she has him serve as her attorney in a case involving the school dress code. In the March 21, 1974, strip, Marcie tells Peppermint Patty that Snoopy is a beagle, finally resulting in her realizing his true identity. Snoopy serves as Peppermint Patty's watchdog several times. She is one of the few girls who does not get disgusted after being kissed by him.

Sally Brown Main article: Sally Brown Like Lucy, Sally does not care that much for Snoopy and often calls him a stupid beagle. Sally usually complains when her big brother asks her to feed Snoopy whenever he is away from home. While she is still an infant, Sally has a friendly and playful relationship with Snoopy. In later years, Sally occasionally enlists Snoopy's help in school assignments. She even treats him to an ice cream cone (a very tall ice cream cone, with scoops of about a dozen flavors) when Snoopy helps her get an "A" on a report about "Our Animal Friends". In one storyline, Sally uses Snoopy as a "weapon" to help protect her from bullies on the playground (Snoopy barks loudly at anyone who threatens Sally, leading Snoopy to comment, "I feel like a can of mace!"), but this ends in disaster when Snoopy sees an old girlfriend of his and runs off to meet her, abandoning Sally and leaving her to get "slaughtered" by the playground bullies.

Schroeder Main article: Schroeder (Peanuts) Schroeder does not mind much when Snoopy sits against his toy piano, except when Snoopy dances on top of the piano, much to Schroeder's annoyance. He also sometimes plays with the notes coming from the piano.

Rerun van Pelt Main article: Rerun van Pelt Rerun, the youngest child character in the strip, plays with Snoopy sometimes. In some strips, Rerun and Snoopy are playing cards with each other, both of them clueless about the rules.

Woodstock Main article: Woodstock (Peanuts) Woodstock is Snoopy's best friend and sidekick. He is a small, yellow bird of indeterminate species. He speaks in a chirping language that only Snoopy and his other bird friends can understand. In return, the birds somehow understand Snoopy's thoughts. In some strips, Snoopy can be seen telling a joke to Woodstock and both laugh so hard they end up falling off the doghouse. Woodstock sometimes sleeps on top of Snoopy's nose, such as in one strip where Snoopy says "Never share your pad with a restless bird".

Fifi Fifi is a major love interest of Snoopy and she appears in Life Is a Circus, Charlie Brown and The Peanuts Movie. In Life Is a Circus, Charlie Brown, Snoopy sees Fifi, a white poodle, at a circus and starts to get attracted to her. He and Fifi do a trapeze act and afterward, he runs away, taking Fifi with him. Fifi decides to go back to the circus, however, leaving Snoopy heartbroken and forced to return to Charlie Brown. In The Peanuts Movie, Fifi (voiced by Kristin Chenoweth) is a pilot just like Snoopy (being redesigned to be bipedal while still retaining her poodle traits), and together they have interaction via Snoopy's typewriter against the Red Baron. He shows how much he cares for her when he cries at Schroeder's house after she is captured by the Red Baron. Snoopy, Woodstock, and the Beagle Scouts set out on a mission to save her. Eventually, they save her, and she shows her affection to Snoopy.