Luster in Bikini Bottom

A Huge Pet-Astrophe is the sixth episode of the first season of SpongeBob's Ponyville Adventure.

Plot
SpongeBob and Patrick were put in charge of taking care of their friends' pets, the Mane 6's Pets, Spike's Phoenix Chick, Peewee and Princess Celestia's Phoenix, Philomena, while they're on a meeting, SpongeBob and Patrick had to be sure they're responsible to do so.

The pets arrived
When SpongeBob, Patrick, Sandy, Squidward, Mr. Krabs and Plankton brought their pets, Gary, Rocky, Wormy, Snellie, Mr. Doodles, Mrs. Wormsley and Spot to Equestria, Twilight Sparkle, Applejack, Fluttershy, Pinkie Pie, Rainbow Dash, Rarity and Spike introduced them to their pets, Twilight's pet Owl, Owlicious, Applejack's Working Dog, Winona Fluttershy's favorite Bunny, Angel Bunny, Pinkie Pie's pet toothless Alligator, Gummy, Rainbow Dash's pet Tortoise, Tank, Rarity's Cat, Opalescence and Spike's old Phoenix Chick, Peewee, Who is now full grown.

Taking care of the pets
So, SpongeBob and Patrick have to take care of the pets as Sandy, Squidward, Mr. Krabs and Plankton helps Discord out with his new county fair and the Mane 6 and Spike go on a meeting with Princess Celestia who assigned them to do some Pet Sitting on Gary, Rocky, Wormy, Snellie, Mr. Doodles, Mrs. Wormsley, Spot, Owlicious, Peewee, Winona, Angel, Gummy, Opal, Tank and Princess Celestia's Phoenix, Philomena.

Feeding the pets
SpongeBob and Patrick give the pets some fresh food and water. Rocky on the other hand isn't hungry or thirsty at all.

Giving the pets a bath
Later, the pets have to take their bath, So, SpongeBob gave each pet a bath (except Rocky).

The Mane 6 and the pet owners came back
Then, The rest of SpongeBob's friends and the Mane 6 returns, They were very pleased that SpongeBob and Patrick had been taken very special care of their Pets, So are Princess Celestia and Spike.

Transcript

 * A Huge Pet-Astrophe (Transcript)