In early Peanuts strips, Charlie Brown was not Snoopy’s owner (as seen in the February 2, 1951, strip), and it was initially not clear who his actual owner was. The September 29, 1951 strip implied that Snoopy was owned by Shermy. 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.”)
Snoopy frequently tries to kiss Lucy on the cheek and / or nose, which Lucy, who is afraid of dog germs, thoroughly hates. These actions occasionally result in Lucy hurting Snoopy. Despite their rivalry toward each other, each seems to care for the other: 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 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.