The only thing I'm scared of now, is that Axle can get outta the pond. I'm scared to wake up beside him one morning

So far he hasn't left the side of the pond, but I know that'll change. I also but some glass & junk in the area he gets out, but he moves it all. So I fixed my room so he cannot get outta the bedroom atleast. & he isn't a bitter out of the water so no worries there, but I still don't want to wake up to see him in my bed.