Is it safe to adopt a second German Shepherd with my current dog?

I'm so glad you and Bruno have a strong bond! I don't think it's a definite that he and another dog will fight when the puppy grows up. However, I would recommend that you introduce them carefully and slowly, and always monitor their interactions until you are certain that Bruno isn't going to play too rough with the puppy. In addition, I would consider having Bruno neutered, as testosterone increases aggressive tendencies and can certainly contribute to dog-on-dog aggression in some cases.

Bruno won't be fully mature physically and emotionally until he is at least 18 months to two years of age. That's because large breed dogs mature slower than the smaller breeds of dogs. But that doesn't mean you can't get a puppy now, and I would recommend having Bruno neutered before getting another dog. Unneutered dogs can and do become very territorial and aggressive when intact dogs enter their home, and that can cause a lot of problems for you to deal with daily. In addition, if you get a female, this can lead to unwanted puppies when she goes into heat. GSDs are a very active breed, and if you have the time and energy to give both dogs all the exercise, attention, and training they need, there is no reason why you can't get another GSD.

They should be fine together, of course it is highly recommended to have them both neutered to avoid any aggressive tendencies, you should also introduce the puppy under your supervision only for a long time until you are sure your dog can be trusted.

With any two dogs, it's never possible to completely predict whether or not they will get along - they all have different personalities, just like people. But in my experience, I have not found GSDs to have any more problems with multiple dogs in a household than any other breed - indeed, I have several clients with multiple GSDs who all get along fine. I would recommend getting a female if you can, since male/female pairs are the least likely to have any aggression issues with each other. Best of luck with your new dog, if you decide to get one :)

This is a great question! Adding a new dog into a household will certainly change the dynamic of things. I would be hesitant bringing any large breed adult dog into a house with a small breed dog without having the dogs meet first. However, since you are considering adopting a puppy, I would have no major hesitation. Each individual dog has a different temperament and reacts to animals, people, and lifestyle changes differently. There is never a guarantee that any housemate dogs will get along as time goes on. Since the puppy would only be able to remember his life with Wilfred, unprovoked attacks seem unlikely. If you go forward with bringing a puppy into your house, make sure Wilfred's lifestyle is relatively uninterrupted. Make sure he has a safe, comfortable space away from the puppy. Be sure to feed them separately - even in a separate room if one is possessive of food. Continue showing Wilfred plenty of love and make sure he has alone time with you.

If your german shepard is not well behaved or aggressive I would highly recommend getting him under control before bringing a new dog into the situation. If he is aggressive as in growling/biting at people he should see a veterinary behaviorist. If he is just wild/doesn't listen, he should go to a dog trainer (with you) to get under control. Ask your veterinarian for a recommendation for a trainer because not all trainers are equal. Once your dog is under control you can consider adding another dog into the household IF your dog is not aggressive to other dogs. You may consider working with a dog rescue who can find a dog for you that gets along well with other large dogs and will allow you to test the dogs out together. Breed doesn't matter as much as personality of the individual dogs.

Two males, properly introduced and socialized, can certainly live together. It is when an intact female is introduced that you may have problems or behavioral issues. Any dog of any breed you chose will need to be gradually introduced to Bruno to avoid confrontation.