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In the beginning of the movie, Snoopy get in a bad mood because of the "No Dogs Allowed" signs ehe keeps running into. To feel better he takes Linus's, blanket and they fight and later fights Lucy with a boxing glove on his nose. Though their is no blood or scars, the characters do appear really beat up.
After Snoopy leaves, Charlie Brown and the others start feeling regret and blame themselves for Snoopy leaving.3/4ths in the film, Snoopy has a going away party to permanently leave Charlie Brown and the others to live with Lila, his former owner. The party scene has a lot of crying from all the characters who attended.
