In Grow a Garden, pets have abilities that can apply mutations, duplicate crops, increase variant chance, and more.
Players start with 3 pet equip slots, but can get up to 8 pet equip slots by trading in aged pets.
You can obtain pets by buying Pet Eggs from the Pet Shop or Event Shops and hatching them.
To hatch an egg, you must place it on an empty spot in your garden and wait for the hatching period.
This article contains a T-Rex pet wiki in Grow a Garden, including its trading value, price, ability, chance, and more in Roblox.
Grow a Garden T-Rex Pet Wiki

The T-Rex in Grow a Garden is a Divine pet that was added in the Prehistoric Update.
You can obtain it by getting a Dinosaur Egg from the Pet Mutator or by completing Dino Quests.
The Dinosaur Egg takes 4 hours and 10 minutes to hatch and has a 0.5% chance of hatching the T-Rex.
It has a passive that eats a random mutation from a fruit in your garden and applies it to other fruits.
Further reading
Grow a Garden Ostrich Pet Wiki