Meet a frog, a dog, and some of Little Critter's other furry friends in this Step 2 Step into Reading leveled reader! Little Critter loves his pets! Meet his fish, frog, cat, and dog in this Step 2 Step into Reading leveled reader, first published in 1988! This book is perfect for children ages 4 to 6. Step 2 Readers use basic vocabulary and short sentences to tell simple stories. For children who recognize familiar words and can sound out new words with help.