Position is not a valid member of a (non-selected?) Model?

I was trying to make a Pets system for my game, and for some reason it keeps throwing the error "Position is not a valid member of Model" It shows that the error is caused in this function:

repeat wait() until game.Players.LocalPlayer and game.Players.LocalPlayer.Character

function MovePet(pet, mode)
	local character = game.Players.LocalPlayer.Character
	local rpet = workspace:FindFirstChild(pet)
	local rmode = mode
	local inc = 0.7
	if mode == "Normal" then
		local base = game.Players.LocalPlayer.Character:FindFirstChild("Left Leg")
		local dir = CFrame.new(rpet.Position, base.Position).lookVector
		print(dir)
		for i=0,10,2 do
			rpet.CFrame = rpet.CFrame + (dir * inc)
			wait(0.05)
		end
	elseif mode == "Float" then
		local base = character["Head"]
		
	end
end

while wait() do
	MovePet(game.Players.LocalPlayer.Name, "Normal")
end

On this line,

local dir = CFrame.new(rpet.Position, base.Positiong.lookVector

I have this in a local script, and in-between the while wait loop and the function the pet is created with this code;

game.Players.PlayerAdded:connect(function(p)
	if p then
		local ppet = Instance.new("Part", game.Workspace)
		ppet.Size = Vector3.new(1,1,1)
		ppet.Color = BrickColor.new(math.random(1,255)/255, math.random(1,255)/255, math.random(1,255)/255)
		ppet.Material = "Neon"
		ppet.CFrame = p.Character["Left Leg"].CFrame
		ppet.Name = game.Players.LocalPlayer.Name
		ppet.CanCollide = false
	end
end)

I tried doing character["Left Leg"], character:FindFirstChild("Left Leg"), game.Players.LocalPlayer.Character["Left Leg"] and also game.Players.LocalPlayer.Character:FindFirstChild("Left Leg")

So pet is a model, you need to do pet.[Part]. There isn't a position property in a model.

If you want the whole model to move, move it by cframe.

you can use PrimaryPartCFrame