When your pet is perfectly healthy and it has just pooped, a fairy might appear in your room. This fairy will fly around for some seconds and then float off screen. If you tap on it before it flies away or throw away the poop before it flies away, you earn 1,000 hearts.
The fairy does not always come, but when it does, the fairy will be not very big, around a fourth of the size of an Adult Pakka, and will have sparkles around it.
Do not worry, the fairy only appears when you come back to visit your Pakka. You aren't missing out on any secret house parties.