I have twenty month old yorkie that came into heat for the first and only time at ten months. The week after her nipples swelled up and disapated. Should I be worried about her? Did she skip a period? Or will she not come into heat again? Is there something that I should be doing for her? Please let me know. I would love to someday see her experience puppies she would make a wonderful mother and I will probably keep all of the pups. That is between me and my grown children. We all love her she has such a gental personality.