It started at Katie's Pet Parlor when Mayor Humdinger's Kitties were getting groomed by Katie, when Ryder, Rocky, Rubble and Robo-Dog came into her Parlor. Katie asks Ryder if they are ready to go another town to get a new part to fix Robo-Dog's tail. Ryder thanked Katie for taking care of the pups while he is away, Rocky then says that she is their favorite pup-sitter and Rubble tells Katie if she is ready, he and Rocky will walk back to the Lookout with her.
Ryder passes Katie his spare pup-pad just in case, Katie thought that nothing could go wrong in a day and tells Ryder to have a safe trip. Ryder and Robo-Dog then leave the Pet-Parlor to head out of town to go get a new part of Robo-Dog's Tail. When Mayor Humdinger overhears Katie and Ryder's conversation over this, he thinks its a great opportunity to make Foggy Bottom a better place then Adventure Bay. He then leaves Katie's Pet Parlor laughing about the idea he was going to make.
Back in his lair in Foggy Bottom, he makes animal sound switching tags for his kittens so they could make chaos and sabotage the pups' rescues by barking out their tools to mess with them. He then sets off to Adventure Bay to make chaos.
Back in Adventure Bay, the Mailman was walking around about to deliver his mail, saying it was a delightful day. Mayor Humdinger then tells his kittens to bark with their barking sound tags to scare the Mailman. The Mailman gets scared and jumps up to a tree wondering where was the barking sound was coming from. Mayor Humdinger then switches off the remote with his kittens sounding like kittens again. The Mailman then wonders where did the barking dogs go, Mayor Humdinger tells him that there is nothing to worry about.
At the lookout, the pups and Katie were playing around when the pup-pad rang. Skye tells Katie about when the pup-pad rings, someone needs help. It turned out to be Mayor Goodway who called, she accidentally mistakes Katie for Ryder. Katie then tells her that she was pup-sitting for him, Mayor Goodway tells her about the Barking Kittens who scared Mr Postman up on the tree and Chickaletta onto the Lemonade Stand Cup and while she was trying to get Chickaletta, she got stuck too. Katie then summons the pups to the lookout, the pups accidentally says Ryder need us instead of Katie. While heading to the lookout, Marshall trips over Cali and wipeout with her to the lookout saying that his hat is a cat, making Cali annoyed.
When the pups reached the lookout, Chase accidentally messes up saying Ryder instead of Katie again. Katie then deploys Skye to help get Chickaletta down and Marshall to get Mr. Postman down. Katie then says Paw Patrol is ready to go, making the pups confused, Rocky then corrects her saying Paw Patrol is on a roll. Katie then corrects herself saying that and goes down the pole onto the mission.
When the pups and Katie reach there, Katie then tells Marshall to help get him down. Mayor Humdinger then sabotages the rescue by telling Cat Marshall to bark and the Mayor saying to retract his ladder. Leaving Marshall confused, Marshall does it again but this time, Cat Marshall barks and Mayor Humdinger calls out his water canons, making them spray on The Mailman. Marshall then wonders who barked down his ladder. When Skye helps to get Mayor Goodway down, Mayor Humdinger tells Cat Skye to bark out to ruin the rescue. When Cat Skye barked out, Mayor Goodway then missed Skye's Hardness, Skye then gives it another try. However, Cat Skye barks again to sabotage the rescue which ends up getting Skye's Hardness stuck on the straw of the Lemonade Stand Cup.
Katie thinks to herself how she could help Skye, only to realize that Mayor Humdinger's Kittens have been barking out their tools to sabotage the rescue. Mayor Humdinger then says that his prank was a successful one and it was time to celebrate. He tells his Kittens that he will be going to Mr. Porter's Café to scare Mr. Porter to get himself free lunch. When Katie overheard what he said, she decided to call Chase and Rocky to meet her at her Pet Parlor. As soon as they arrived at the Parlor, Katie then brings a basket full of yarn balls to distract Mayor Humdinger's kitties so that they could turn off his remote to not make anymore dog sounds. When the pups and Katie arrive at the Café, Katie then puts yarn balls in Chase's launcher so he could launch yarn balls distracting the kittens and Mayor Humdinger. As soon as they kittens got distracted with the yarn balls and ran away, making Mayor Humdinger chase after them, Katie then tells Rocky to reprogram the animal switching remote so that it won't make dog sounds.
When Mayor Humdinger's Remote got reprogrammed, he was shocked to see that his kittens were making bird sounds instead of dog sounds. He then tells his kittens to stop acting like birds because he was trying to eat. However, his kittens were too engrossed playing with their yarn balls. As soon as Cat Skye & Cat Marshall stopped barking out Skye's and Marshall's tools, they were both able to help Chickaletta & Mayor Goodway and the Mailman down respectively. Later, Katie, Rocky and Chase then help clean Mr. Porter's Café, Katie then tells him that his Café his cat-dog-bird free. Mr Porter thanks them for their help. Mayor Humdinger had to go all the way back to Foggy Bottom hearing his kittens acting like birds which made him annoyed, he got more annoyed when his remote got spoiled.
Once the pups and Katie were done with their mission, the pups and Katie were playing at the lookout. Katie then tells the pups they were such good pups, Katie then gives Cali a yarn ball to play because she was feeling down and tells Cali that she can't be replaced. Just then, Ryder and Robo-Dog came back on the PAW Patroller. Ryder tells them that Robo-Dog's tail has been fixed and asked how today went. Chase says that Katie did a good job. Ryder said he knew she would and thanked her, Katie then says welcome and if your town is full of barking kittens, just yelp for help. This makes Ryder and Robo-Dog confused but shares a good laugh with the Pups and Katie at the end.