Peanuts cartoonist Charles Schulz wrote that "happiness is a warm puppy".
But it might also be a snuggly piglet, an inquisitive goat or a chilled out alpaca.
The youngsters at Kidz First Children's Hospital probably think so.
They enjoyed a morning of pet therapy at the South Auckland hospital, spending time with cuddly new friends.
Balloons, bubbles and old-fashioned games, such as Pin the Tail on the Donkey, also helped put smiles on their small faces.