Thanks everyone, they seem to be getting along just fine. At first the older one would just stare at it wondering what is it and why it is moving... so adorable and funny! But now they are each just doing their own thing.
Hehe thanks again. I was so excited and as the UPS guy is walking towards my house.... holding the box sideways and swinging in long strokes *sigh* I wanted to smack him upside the head, since the box was clearly labeled which side is up and live animal and all...