Friend for Bella....

I'm thinking about getting my girl Bella a friend.  I work everyday and when I leave in the morning she always looks so sad.  Most days she spends sleeping on our bed trying to get as close to our pillows as she can without getting in trouble.  She could use a friend.   My daughter came home from school for Thanksgiving and along with her came the stray cat she adopted.  Lily was so sweet and lovely, the whole house fell in love. Would a cat be a good friend for Bella?   I really don't know. Although I enjoyed Lily, I'm thinking more about a rescue dog or a puppy.  Bella has more than enough love in her heart and with dogs being pack animals the more the merrier right!  I will have to sleep on this one.  I know there are a lot of you who have more than one dog.   Please let me know how your dog adapted to his or her new friend.