In this picture Howard the puppy is introduced to Audrey the rabbit.  It's really important for puppies to socialise with other people, dogs and animals from a young age.  This will help them remain calm and unperturbed when they encounter situations involving new people or animals.  Using treats when Howard meets Audrey and calming words, plus head and neck strokes, this creates a positive association with the rabbit. 

Owners should always exercise caution when introducing their dogs to other animals in the household and should not leave them unattended until they have been fully socialised.