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Peanuts by Charles Schulz for May 28, 1951
Transcript:
Patty stoops down next to the outdoor tap, rubbing her hands together. She says,"Gee, my hands were really dirty"<BR><BR> She looks behind her and says,"Hmm..no towel...."<BR><BR> She turns and sees Snoopy. He looks at her puzzled as she exclaims,"Ah!"<BR><BR> He sits grimacing as she happily wipes her hands in his ears.<BR><BR>
The yet-unborn Sally Brown would have something to say about that (“You have to wash your hands again because you touched the dog”).