I've pondered this very thing because I have an older Collie who is a family pet, must be 9+ and doing great, but I want to bring in a pup for hunting/family pet.
I know my current dog can exhibit jealousy whenever other dogs visit. She's fine socialising with others but if they come into her zone, that's when she can be a bit protective.
I'm guessing, being a pack animal, she will still need to be treated in a way so that she feels that she's higher up than the new pup and will still need to be greeted first, etc
Time will tell...
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