| # | Book Title | Author | |
|---|---|---|---|
| What's Your Sound, Hound the Hound? | Willems, Mo | ||
| Who Flies, Cat the Cat? | Willems, Mo | ||
| Who is That, Cat the Cat? | Willems, Mo | ||
| Who Says That, Cat the Cat? | Willems, Mo | ||
| Who Sleeps, Cat the Cat? | Willems, Mo |
Juvenile Series and Sequels
| # | Book Title | Author | |
|---|---|---|---|
| What's Your Sound, Hound the Hound? | Willems, Mo | ||
| Who Flies, Cat the Cat? | Willems, Mo | ||
| Who is That, Cat the Cat? | Willems, Mo | ||
| Who Says That, Cat the Cat? | Willems, Mo | ||
| Who Sleeps, Cat the Cat? | Willems, Mo |