What a wonderful thing you did for this little Yorkie. I've read many posts that sound like yours and in time, the posts became happy and positive and had wonderful pictures of the two furbabies together. I've noticed that each new dog introduced seems to take time to adjust and so does the original dog in the home. Some become fast friends that spend lots of time together and others seem to find a mutual respect and acceptance at varying distances. I would be so worried if I were you right now, but this will pass. Many have gone before you and found success with time and patience. When you are down just think about how wonderful you were to rescue this puppy. So many members here will help you through this adjustment time. Keep the faith and know that your hard work will be rewarded with double puppy kisses before you know it! Be sure to keep posting pictures and keep us updated.
