I have a German Shepherd/Sheltie mix in my house who is just over a year old and is neutered. He is very small (a sheltie body) weighing only 35 lbs. He can be very skiddish at times so we don't anticipate a dominance stand from him and he gets along very well with other dogs. We are looking at adopting a German Shepherd Dog who will be neutered as well. He will be significantly larger then our shepherd/sheltie. Would there be issues between the two of them despite being neutered. The GSD we are considering adopting is only 4 1/2 months old and has grown up around other dogs, both male and female, and doesn't have and issues. Would there be any issues? Thank you!!!