Sounds like one of the cats I got after Minnie.

Buttons isn’t as tiny, but still fairly wee at 9lbs. And at 16 she still runs around, especially when being chased by the poop demon. Her recently deceased brother was between 15-18lbs and shaped like a pug.

His name is Jove and he's 10. Found at a school when picking up our son when he was still in preschool. Imprinted on me to the point of obsession. Best friend you could possibly ask for.