Wolfie the bunny by Ame Dyckman

The Bunny family has adopted a wolf son, and daughter Dot is the only one who realises Wolfie is going to eat them all up! Dot tries to get through to her parents, but they are too smitten to listen. A new brother takes getting used to and when (in a twist of fate) it's Wolfie who's threatened, will his big sister Dot save the day?