[Cupcake]

I have a 10month year old yorkie. Well, a week ago a friend of a friend had to get rid of her maltese due to housing reasons, and divorce. Her and cupcake get along fine. But I am now realizing two dogs are alot of work, and Im not attached to the dog like cupcake yet and I am regreting getting her. The dog is cute, nice, potty trained, and she is great. Why am I having this feeling? Will this feeling go away? How long should I give it?