Pet Disappears Instead of Following Player?

EDIT: I made the map semi-transparent so i can see the pet, it just falls forever

I'm trying to understand how pets work in the game, so I've done a bit of experimenting, and this is what I have:

local newPet = script.Parent
newPet.CanCollide = false
newPet.Anchored = false

local petPos = Instance.new("BodyPosition", newPet)
local petGyro = Instance.new("BodyGyro", newPet)

petGyro.MaxTorque = Vector3.new(900000,900000,900000)
local owner = newPet.ID.Value
local followPosition = Vector3.new(2,2,0)

while wait(1) do
    local ownerObj = workspace:WaitForChild(owner)
    local player = game.Players:FindFirstChild(ownerObj.Name)
    local ownerPos = ownerObj.HumanoidRootPart.Position
    local stopAt = ((ownerPos - newPet.Position).magnitude - 1) * 1000
    petPos.P = stopAt
    petPos.Position = ownerPos + followPosition
    petGyro.CFrame = ownerObj.HumanoidRootPart.CFrame
end

the pet is for just me, and i have a string value of my username in the pet, when I join the pet just disappears. I've changed the pet, and it still disappears, no error messages. Please help me, I'm brand new to coding.