I can't believe I am giving any suggestions about Giant Schnauzers, but I have done a considerable amount of reading on them POST adoption of Izzie (13 month old now). True to what you will read about GS, they are very territorial and would do best with a dog their own size. If your schnauzer is already of substantial size and you bring in a small puppy, you could be in for trouble. I have a 23-lb cockapoo who is now 14 years old. He, too, was a rescue dog and he is now deaf and blind. Because of the size difference between him and Izzie, he often ends up getting hurt. This is not because Izzie is mean, it is more the fact she does not realize her size and strength.
I love little dogs, but in fairness to the dog's well-being, I would think twice before I brought a youngster in with a GS of any size. Just my own thoughts....
