How to prevent my "pet" from falling out of the world with this script?

So I have a pretty basic script here.

local NewPet = script.Parent
NewPet.CanCollide = false
local PetPos = Instance.new("BodyPosition", NewPet)
local PetGyro = Instance.new("BodyGyro", NewPet)
PetGyro.MaxTorque = Vector3.new(400000,400000,400000)
local Owner = '14zanderbilt'
while wait(0.01) do
	wait()
	local OwnerObj = workspace:WaitForChild(Owner)
	local OwnerPos = OwnerObj.HumanoidRootPart.Position
	local StopAt = ((OwnerPos - NewPet.Position).magnitude - 5) * 100000
	PetPos.P = StopAt
	PetPos.Position = OwnerPos + Vector3.new(-3,5,3)
	PetGyro.CFrame = OwnerObj.HumanoidRootPart.CFrame
end

Tho only problem is, that when I have a too big of a "pet", it falls out of the world. Any ideas? Please note that the script is a server script, and that it works with a "light"/small "pet".

It's falling out of the world because its CanCollide property is false. This means that wherever the pet is, it will fall right through the world and after a while, it will despawn. Meaning it can't follow you.

local NewPet = script.Parent
	NewPet.CanCollide = true
	local PetPos = Instance.new("BodyPosition", NewPet)
	local PetGyro = Instance.new("BodyGyro", NewPet)
	PetGyro.MaxTorque = Vector3.new(400000,400000,400000)
	local Owner = '14zanderbilt'
	while wait(0.01) do
	    wait()
	    local OwnerObj = workspace:WaitForChild(Owner)
	    local OwnerPos = OwnerObj.HumanoidRootPart.Position
	    local StopAt = ((OwnerPos - NewPet.Position).magnitude - 5) * 100000
	    PetPos.P = StopAt
	    PetPos.Position = OwnerPos + Vector3.new(-3,5,3)
	    PetGyro.CFrame = OwnerObj.HumanoidRootPart.CFrame
	end

I think you can use WeldConstraint. This will keep it attached.

local NewPet = script.Parent
NewPet.CanCollide = false
local PetPos = Instance.new("BodyPosition", NewPet)
local PetGyro = Instance.new("BodyGyro", NewPet)
PetGyro.MaxTorque = Vector3.new(400000,400000,400000)
local Owner = '14zanderbilt'
while wait(0.01) do
    wait()
    local OwnerObj = workspace:WaitForChild(Owner)
    local OwnerPos = OwnerObj.HumanoidRootPart.Position
    local StopAt = ((OwnerPos - NewPet.Position).magnitude - 5) * 100000
    local Weld = Instance.new("WeldConstraint")
    Weld.Parent = NewPet
    Weld.Part0 = NewPet
    Weld.Part1 = OwnerObj.HumanoidRootPart
    PetPos.P = StopAt
    PetPos.Position = OwnerPos + Vector3.new(-3,5,3)
    PetGyro.CFrame = OwnerObj.HumanoidRootPart.CFrame
end

If this doesn't work, leave your problems in the comments and I will be happy to help you (as said below).

Happy to help, b_mni.

Try creating a remote event to transport server to local and local to server. It might work because only one side of the game can see it.