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You don't need to TRAIN your Rott to be protective of you, they do that naturally. Love him, socialize him and make him a part of your family...nature will do the rest

I guess thousands of dollars in medical bills and a lawsuit and possible jail time are more preferable. There is no way you can properly train your dog to protect without creating a walking liability. What happens when the mail carrier comes? meter reader? UPS/FedEx? A relative/friend?

Simple fact having the dog in the yard is usually enough to keep someone from your yard, but not always. ALSO not all dog bite laws give get out of jail cards for trespassing.

You should get a shock collar it works when your dog goes out of it`s boundry it starts making a noise to warn the dog then if still stays there besides moving away it gets a very light shock

print a picture or a person or ethnicity you are not fond or and attatch it to a stick and chase your dog with it until your dog snaps and attacks it. then the rest is cake.