diff --git a/src/routes/book.ts b/src/routes/book.ts
index 01b542c..5b9fd27 100644
--- a/src/routes/book.ts
+++ b/src/routes/book.ts
@@ -194,6 +194,7 @@ bookRouter.post(
         species: body.petSpecies,
         breed: body.petBreed ?? null,
         coatType: body.petCoatType ?? null,
+        petSizeCategory: body.petSizeCategory ?? null,
       })
       .returning();
     const pet = petInserted[0];