"Dozens of fun-loving dogs explore a sunken ship, take a rocket to the moon, and visit an Egyptian tomb--where they are chased by a giant cat"--

Doggo, an older dog, is used to things a certain way. When Pupper shows up, Doggo's routine changes. Pupper is very playful and soon the humans realize Pupper needs some training. But when Pupper comes back from puppy school, Doggo senses that, although Pupper is well-behaved, he isn't happy. So Doggo shows Pupper how to rediscover his fun side.

"Doggo likes routine: napping, eating, and more napping. Life is good. Life is good for Pupper, too, even though he worries a lot, about things like giant squirrels. If he were braver, he might even be a hero. Maybe even a hero who can fly! But heroes aren't afraid of giant squirrels ... When Doggo and Pupper meet a baby bird who also has worries, they are determined to help. Doggo and Pupper may not know how to fly, but they are very good helpers....

"Finding an egg, Rocket and his friend Bella search for its owner, to no avail, and wonder if they will ever find out where its nest is and who it belongs to"--