I have two 17 year old cats. My daughter has a friend staying with us this weekend and she is bringing her small dog (Corgipoo, 10 months old). The friend has asked if we can dog sit (the dog stays with us) for a week or two this summer. We would be happy to but are concerned about the interaction between the dog and our cats, and any negative impact it would have on our older cats. I guess this weekend is a trial to see how the interaction goes. How do I introduce the dog to the cats? What can I do to help things go as smoothly as possible? Any advice would be much appreciated.