Fluffy, brown, and optimistic, Marshmallow knows he's the luckiest puppy in the whole world. After all, how many dogs get rescued from a rainstorm and treated to tropical cereal and cozy beds by their best friend, Winston?
But when a sudden fright sends Marshmallow running wild into an unfamiliar neighborhood, his lucky streak is put to the test.
Lost in the city, Marshmallow finds a pair of stray dogs who show him a whole new kind of luck-like sneaking into unattended pizza delivery cars and chasing beefy odors down the street. Life on his own is a wild adventure... until a stranger with a mysterious connection corners him and his new crew inside a stinky, abandoned cheese factory.
Trapped in a cage, Marshmallow needs more than just good fortune to escape. Can the "luckiest puppy" pull off a daring breakout, rescue his friends, and find his way back to Winston?