- January 1, 1973
- January 2, 1973
- January 3, 1973
- January 4, 1973
- January 5, 1973
- January 6, 1973
- January 7, 1973 (Poochie's only appearance in the strip. End of a series of Sunday strips about the character which began on December 17, 1972, the ending quote would be repeated by Sally in Snoopy's Reunion)
- January 8, 1973
- January 9, 1973
- January 10, 1973
- January 11, 1973
- January 12, 1973
- January 13, 1973
- January 14, 1973 (This strip is adapted in It's Flashbeagle, Charlie Brown)
- January 15, 1973
- January 16, 1973
- January 17, 1973
- January 18, 1973
- January 19, 1973
- January 20, 1973 (This strip is adapted in the segment "Football" of the 1983 The Charlie Brown and Snoopy Show episode "Chaos in the Classroom")
- January 21, 1973
- January 22, 1973
- January 23, 1973
- January 24, 1973
- January 25, 1973
- January 26, 1973
- January 27, 1973
- January 28, 1973
- January 29, 1973 (Start of a storyline adapted in the episode "Amateurs" from the 2014 French TV series Peanuts)
- January 30, 1973
- January 31, 1973
| ← December 1972 | February 1973 → |