u could get some geese too. or i always suggest border collies. iive had them for years and they make the best family dogs, ranch dogs, and guard dogs. And u have plenty of space for a border collie to get exercise. I suggest a border/ aussie mix. Austrailian shepards have all the perks of a border colle without the hyperness. but like i said geese are the best watch dogs too and they will blend nicely with ur flock or u can get a couple outside ur pen. if u want loud "aggressive" honkers i suggest chinas or africans. if u want a sweeter goose get a toulouse.