How do I make this pet ability script function?

I've been trying to make this pet ability where when the pet is equipped, it gives a certain amount of hearts (the currency) per second.

I have this in leaderstats:

if game.Players.LocalPlayer.PetsEquiped("1").Value == "pet1" then	
while true do
		game.Players.LocalPlayer.leaderstats.Hearts.Value = game.Players.LocalPlayer.leaderstats.Hearts.Value + 2
		wait(1)
	end
end

1 is the pet name, pet1 is the value of 1 when the pet becomes a StringValue under the folder called PetsEquiped.

I've tried putting this in its own script under the pet itself, and I've tried doing other similar variations of this where I just change the first line, for example

if game.Players.LocalPlayer.PetsEquiped("1") then
while true do
  		game.Players.LocalPlayer.leaderstats.Hearts.Value = game.Players.LocalPlayer.leaderstats.Hearts.Value + 2
		wait(1)
	end
end

Nothing seems to work, so if anyone could at least guide me in a direction as to what I should be doing, that would be helpful, thank you.