I have been reading this thread and kept telling myself "stay out of it", but here I am. I am what my husband called "a very epowered female" - he liked that about me so no problem. I don't hear that in your narrative.
Perhap you if you really want a dog tell your husband you want/need to discuss your plans with him, and it he give you that "i don't want to discuss this" you may want to tell him that if he walks away you might consider his lack of willingness to discuss this with you as his way of giving you permission to proceed with your plan (that he has not thus far listened to).
Now I can see that this might get ugly and if it does you have to make your decision from there. But it is never correct to allow your husband and/or on disrespect you -- and if tht is happening you need to understand you ARE allowing it. If that is OK with you, them I'm sure we will all be OK with it and you too. Just hate to see you without your own little furbutt to love!
PS Yorkies are difficult to potty train, so don't kid yourself in that area, it can be frustrating and perhaps more difficult with no support.
What ever you decide will be right for you and your family
Your sound like a loving and caring person!