Carabara I just read your note about the standard poodle. Let me just make a huge "plug" for standard poodles. I was fortunate enough to be owned by a black standard for 8 years. Whitney was as close to being a human as is possible. She was gentle, loving, affectionate and intelligent. We introduced CATS (two of them, one at a time) into her life after having her about 5 years. She welcomed them into our home and they quickly became "buddies." Anyway, back to the original problem of the Yorkie and the Boxer......I think it depends a lot on the dogs involved. The puppy will do fine, and I think if he/she is introduced to the Yorkie in a gradual way, with lots of love and reassurance, the Yorkie will adapt. It may just give him a "second wind" so to speak! Good luck and let us know how you do!!