I have a big pond but unfortunately we also have a very large hawk population and I won't risk it. I almost lost a 4 month old puppy to one and won't take that chance again. He'll go in a 10'L x 5'W x 3'H when he out grows the 150. We set up a special account for him the week we got him and $50 a check gets direct deposited for the future build. It's so nice when the spouse enjoys something you love.