Oh how sad and awful! What a terrible start to your Yorkie ownership
I see this is your first post too- I welcome you to Yorkie talk but am so sorry your visit started here. All things said about cats, territory and prey are so very true. I think you need to rehome your Yorkie or your cat. It sounds like your cat is a long term family member and perhaps a Yorkie doesn't fit in with your household? I know that is a painful thought but there are many excellent rescues if that is the case or perhaps the breeder would be willing to work with you also. I hope your little guy is healing well and if it's the cat that goes I will look forward to seeing pics of your little buddy- yorkies really are amazing and special dogs.
