I am so sorry to hear the news about your yorkie biting your girl, it is common knowledge that small dogs, especially yorkies dont like young children, however very strange that they would bite and cause bleeding! They normally just scare the child with a nip. I have rehomed 2 yorkies from families with small children for the same reason. Hope that you get the problem sorted soon. Justine, alfiesmummy.
www.alfieslostterriers.com You may want to post on my site as we have a vet, dog groomer and dog handler on site that may well help you with advice.