JackTaylor:this will be the only one I will be adopting as I have a border collie already at home and he is now depressed because of the new dog.
Time for you to be the dog psychologist. How far apart in age are they?
I introduced an 8 week old pug to the 4 year old I already had and the older one started acting really reclusive. Wouldn't go near the puppy and stayed on the couch. This went on for about 2 weeks and stopped suddenly one day. I was playing with the puppy on my lap and while she was nipping my hands I was saying "ow,ow" like she was hurting me. The older one sat up on the couch and gave 2 really loud, sharp barks. The puppy sat straight up and sat stock still, staring at the older one. It was really curious but I think the older one had just had enough and decided to assert herself when she felt the little one was harming me.
I can't say they lived happily ever after since then because the older one died tragically from a pug nervous disorder a month later but I got another one right away (2 months apart) and there was never an issue. They're like twins now. Yours will get there. :-)