The guard dogs haven't seen a sign of Wolf in weeks, but D.O.G. can't shake the feeling that something wicked will try to ruin the pups' Graduation Day.

It's the Howlers vs. the Growlers on the fetchball field. Will Spark be the first stray to win the MVP trophy, or will Bite take the title once again?

The pups need all the extra paws they can get to help break King out of Animal Control when he's snatched up after his hideout is suddenly raided.

Some uninvited guests look to stink up this year's Howlathon during the harvest moon. But Corazon has a smelly secret weapon to stop them.

Everyone thinks Spark is the Chosen One according to school prophecy. But since Spark spent her life as a stray, she's not used to special treatment.

Spark explains her side of the story after leaving the Academy, but Corazon and Whiz soon find out it was all part of Professor Fitz's sinister plans.

The greatest friendship on earth is at risk when the constellation that powers Pup Academy fades out and humans no longer want dogs as best buds.

Spark is finally feeling like she's found a place she belongs ...until King calls in the favor she owes him. Now Spark must decide whether to honor her commitment to her paw-pact with King - or betray Pup Academy and all of her new friends.

Pup Academy celebrates a special day of student reviews, Charlie shares a meaningful gift with Morgan, and King's dark past comes to light.

When Morgan accidentally shares photos of Pup Academy with Wolfehead Middle School's biggest gossip, the Academy is in danger of being revealed to the world unless Morgan can get the photos back and cover up his mistake.

D.O.G. and Charlie's plan to pair up Morgan and Spark for a class assignment to bring them closer together backfires when the duo ends up lost in the dangerous Wildwood forest.

It's time for the annual student exchange, and Pup Academy is getting ready to welcome a - kitten. Spark tries to hide her secret friendship with this kitten from her judgmental classmates, as Corazon discovers cats aren't as bad as he thought when he's sent to Kitten Academy to learn about acceptance.

Charlie and D.O.G take a day off, leaving Morgan in charge of the Academy on his own for the first time. Morgan thinks he's got it covered but doesn't realize his plan is about to be unraveled by Izzy, who is set on getting to the bottom of what her pup does all day.

After a bad day at Pup Academy, which makes Spark question where she belongs, Spark is ready to quit the Academy for good. But when she skips school to hang with King and the Lost Dogs, Spark learns the grass isn't always greener on the other side.

Corazon gets himself into big trouble when his mischievous neighbor, teacup pup Oopsie, named after the only word she knows, follows him through the secret fire hydrant portal to Pup Academy where 'no outside dogs are allowed.' Meanwhile, Morgan tries to tech-up the school with not-so productive results.

Corazon lies about having a famous uncle - Dude from "The Descendants" - not knowing the real Dude is coming to Pup Academy to judge the annual talent show, as Morgan and Charlie engage in the ultimate prank war.

Morgan struggles to balance his overbooked schedule between work at Pup Academy and his studies at his middle school, much to the frustration of his project partner Izzy, who really wants an A+.

Spark gets into a sticky situation when she makes up an imaginary human best friend to avoid telling her pup friends she's a stray pup, as Morgan endures Charlie's off-the-wall caretaker training.

Meet the freshman class at Pup Academy, a secret school where pups become dogs. There's goofball golden Corazon, shy sheepdog Whiz, stray boxer Spark and 10-year old Morgan, who is about to discover his secret destiny: his family have been the caretakers of this secret school for generations, and it's time for Morgan to start his new job.