I would suggest checking out your local laws before you start telling or suggesting to someone the care of his animals is not good. We don't have limits to how many animals per acre here in Wyoming where I am, alot of places don't. Heck, around here, during winter, most folks don't even give water and let the horses eat snow all winter, no law stating they have to have water during winter, they can get what they want from eating snow. I don't like it, but that is the law. Heck you can have 20 horses on an acre if you want, as long as they are fed. Junk everywhere, mud, wire, no laws at all.
So, please check before you go to him and find yourself accused of harrassing someone when there are no laws to back you up.