I have 2 sisters, 2 yrs. of age. They adore each other. I got the Gracie first, for abt 7 months, she was an only furbaby. Hard to train, would only eat from my hand, cried at night. I felt like she was lonely. We got a chance to purchase her sister and jumped at the chance. What a difference it made with Gracie. They seemed to recognize each other right away. Gracie started using the potty pad like Katierose, eating dry kibble and sleeping all night. I would highly recommend getting a second furbaby.