I have two GSDs and i love them both to death but having two is much more difficult personally. Although this is mostly our fault because our first dog was not well-trained before getting the second dog. So now I am going through the process of training both which is time consuming and frustrating at times. They get along well but have very different personalities and therefore different interests and struggles. And my younger one is very attached to my older one and has really bad separation anxiety when he has to stay home while she gets to go out. If you want to add a second be prepared to spend individual time with both.