Does anyone have 3 GSD's? Do they All get along? We have 2- a 2 year old and a 9 month old and we are looking to adopt a 13 week old. But we're afraid that they won't all get along considering they're all males. We're trying to arrange a meet up with the new pup and our 2...but I'm looking for some advice, tips, etc..from ppl that have been there.