My dog once chased its own tail for like ten minutes straight. It was so hilarious seeing it go round and round, completely oblivious to how silly it looked.
A parrot in a zoo was known for its sassy attitude. It would mimic the zookeepers in a really funny way. One day, it just dropped dead while squawking at a visitor. The zookeepers were shocked at first but then they remembered all the hilarious moments with the parrot. It was sad, but they also thought it was kind of fitting that the parrot went out making noise and being its usual self.
I have a cat that loves to hide in boxes. One time, I bought a new pair of shoes and left the box out. My cat jumped in and refused to come out. When I moved the box, it meowed like it was on a roller coaster ride.
Our cat once climbed into a box that was way too small for it. It got stuck and meowed pitifully. But when we finally got it out, it immediately jumped back into the box as if it had forgotten how uncomfortable it was. That was really funny.
My family has a dog. One time, the dog stole my dad's slippers and ran around the house with them. When my dad chased it, the dog hid under the bed and refused to come out until my dad promised it a treat.
I have a dog. One day, it saw its reflection in a mirror for the first time. It started barking at the 'other dog' in the mirror and was really confused when the 'dog' in the mirror did the same. It was hilarious.
One funny pet story on YouTube is about a cat that tries to steal a dog's food. The cat sneaks up very quietly, but as soon as it touches the bowl, the dog wakes up and chases the cat all around the room. It's hilarious to watch their little chase.
A girl painted her pet rock to look like a famous movie star. She would take pictures of it in different movie - like scenarios. For example, she had a little cardboard set of a jungle and put the rock there as if it was an explorer. It was super funny to see the rock in these situations.
Once I had a pet snake named Slimy. One day, it got out of its terrarium and I found it curled up in my shoe. It was so unexpected and hilarious. I had to carefully remove it without scaring it.