Same thing happened here. I sicked the dog after them but was he'd drown trying to swim them down. I shot the 22 semi off half a dozen times and they would'nt come off the pond. Got out the 12 ga and fired near them 3 times with no success. Next day they were gone. I saw them down the road at the graveyard pond. I figured the goslings couldn't fly yet so the parents just walked them away from a threatening place. Just my guess.

Do nature a favor, spay/neuter your pets and any weird friends or relatives.