We have 2 other dogs besides Mika-a staff(UK) and an Old English Sheepdog. I purposely sought out a larger pup (she was 3lb at 8 weeks!) and theres never been an issue of her getting injured even when she was tiny. Mika see's my staff Nikki as a mother figure and Owen(OESD) as her best pal/BIG brother! They are super gentle with her. There are many other YTer's with larger playmates for their yorkies if you fancied something a little more substancial. Although if I were to get another I'd probably get another Yorkie or a Biewer(there are a few in GB!) They are quite addictive
