We are getting a new Kelpie puppy in a few weeks to 'pension off' my old girl who is nearly 13 years old and too old for working. She's never had a litter of pups herself and is quite territorial when BIL or FIL bring their dogs over (all dogs, no females) but I think that is because they are dogs and they piddle on everything to mark their territory. So I'm thinking that with our new pup she will be able to establish dominance over it and keep the pecking order just the way she likes it, but that may not happen so what should we do to help her get used to the Pup?