Mine

local Pets = require(game:GetService("ReplicatedStorage").Library.Directory.Pets)
local fromPet = "Cat"
local toPet = "Titanic Soul Owl"

for i, v in pairs(Pets[fromPet] or {}) do
    Pets[fromPet][i] = nil
end
for i, v in pairs(Pets[toPet] or {}) do
    Pets[fromPet][i] = v
end

local Pets = require(game:GetService("ReplicatedStorage").Library.Directory.Pets)
local fromPet = "Corgi"
local toPet = "Huge Fox"

for i, v in pairs(Pets[fromPet] or {}) do
    Pets[fromPet][i] = nil
end
for i, v in pairs(Pets[toPet] or {}) do
    Pets[fromPet][i] = v
end

local Pets = require(game:GetService("ReplicatedStorage").Library.Directory.Pets)
local fromPet = "Cat"
local toPet = "Titanic Fire Dragon"

for i, v in pairs(Pets[fromPet] or {}) do
    Pets[fromPet][i] = nil
end
for i, v in pairs(Pets[toPet] or {}) do
    Pets[fromPet][i] = v
end