In Grow a Garden, Pet Mutations give pets unique abilities, stat boosts, or visual changes.
You can mutate a pet that is level 50 and above by submitting it to the Pet Mutations machine.
Pet Mutations offer different passives like XP boosts, applying fruit mutations, and more.
The chances of obtaining each mutation differ, with rarer ones having a less than 1% chance.
This article contains a Tiny Pet Mutation wiki in Grow a Garden, including its ability, boost type, boost amount, and chance.
Grow a Garden Tiny Pet Mutation

Pet is very tiny! Has 20% slower hunger rate. Gains 5–30 XP per second.
Size Modification
-90%
6.43%
The Tiny Pet mutation in Grow a Garden shrinks a pet’s size.
It makes the pet have a 20% slower hunger rate and gains 5-30 XP per second.
Its boost type is a size modification, and it has a boost amount of -90%.
The chance of obtaining it from the Pet Mutations machine is 6.43%.
Further reading
Grow a Garden Mega Pet Mutation Wiki