Great-Grandpa's in the litter box /
by Dan Greenburg ; illustrated by Jack E. Davis.
- New York : Grosset & Dunlap, c1996.
- 59 p. : ill. ; 20 cm.
- The Zack files ; 1 .
Zack takes home from the local animal shelter a scruffy tomcat who not only talks but claims to be the reincarnation of Zack's Great-Grandpa Julius.