@hollie My wife uses a powered wheelchair with a low centre of gravity — I think it's to do with manoeuvring in a tight space since I've seen her literally spin on the spot before — and it is very heavy. Yet I have seen it, her majestic dog seemingly pulling the thing along — or at least tilting it a bit — purely because he was excited to see one of his friends also on a lead-walk.
Wondrous beasts!