Lenny is a playful and sociable dog who is best friends with a turtle named Otto. They play together every day and love going to the park, chasing squirrels and watching all the children playing happily. One day, the friends encounter Ava, a little girl who has nobody to play with. Luckily, Lenny and Otto are great at making friends, and they begin seeking out other children for her to have fun with. Soon Ava learns that making friends means that you have to help others, take turns, share things and join in with others. Before long, she has made a whole lot of new friends to play with any time she is at the park.