| Issue | #4 |
| Published | July-August 1952 |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | Julius Schwartz |
| Pencils | Gil Kane |
| Inks | Frank Giacoia |
| Synopsis | In a flashback story rex recalls how he and the then Lt. Dennis won the silver star in WWII. Rex quote: "He doesn't recognize me! His eyes are empty" |
| Script | Robert Kanigher |
| Pencils | Gil Kane |
| Inks | Frank Giacoia |
| Synopsis | When Bobo's owner, Fred Thorpe, is murdered he leads Sheriff Chase to the killer. Bobo Quote:"Ik-ik-chk" |
| Script | John Broome |
| Pencils | Carmine Infantino |
| Inks | Sy Barry |
| Reprinted | In Big Boy (Artima, 1956 series) #22 July 1958; Tarzan (DC, 1972 series) #230 (April-May 1974) |
| Synopsis | Rex teaches dog hater Frank Ferris that Rex is mans' best friend. Rex quote:"Don't go in there it has an evil scent.." |
| Script | John Broome |
| Pencils | Gil Kane |
| Inks | Sy Barry |