I have 3 GS one 3 yr one 13 months and one 6 months . I just picked up a 4 pounds yorkie 5 months. I had her in her crate and let the GS smell her but how do I let them know can’t play with her. They play very ruff with each other. One I don’t trust her yet. Has any one got a puppy small to introduce. My husband golden doddle we keep separated because they would be to ruff on her .