[Kirska]

When you get home, let the new puppy wander around the whole house and get her scent into every room (or every room your existing pup is allowed in) before allowing the pup you already have to go in. This will make her seem like less of an intruder.

Having two dogs is great. I believe it really improves the happiness of the dogs as well to have a canine friend with them all the time.