I have friends who have a 4-yr old dog, and they want to add a puppy at the end of this month. This is all fine and great but they want to keep the puppy and the older dog confined in the same room when they are away at work. I tend to think the dogs should be separated at least for a few months if only to make sure the older dog does not attack the younger one out of jealousy or anything, and also so that they can have a break from one another. (separated by at least crating the puppy, not necessarily in different rooms.) But I've never had more than one dog at a time, so I'm not sure if my thinking is correct and wanted to ask you knowledgeable people. The dogs are Airedale terriers if that makes any difference, which I know nothing about personally. Also the older dog is female and they want to get another female. After reading boxerworld for several months this just screams mistake at me! What advice do you think I should give my friends? Thanks!