My major piece of advice to people is to not treat the new dog better than the dog that was there first. This can cause problems.

For example: Feed, pet, give treats, praise, etc., your current dog first. Let your current dog lay closest to you. If you can only take one dog for a ride, take the current dog. You can ease up on this once the pack order has been established and everyone knows where they belong.

When you first bring the new dog home, take them to neutral territory, like a park, to introduce them for the first time. Do NOT start out the meeting by throwing a ball and seeing who get it first. Remember too that dogs will do better meeting off leash. Being on leash makes them feel trapped and defensive.

Just a couple of my favorite basics.

LOL sometimes I come home with a new dog and just put it in the backyard right away with my GSD female and hope that nobody gets killed. She is the absolute best when it comes to integrating new dogs into the household. Once she gives the all clear, all my other dogs just fall in line and god forbid if one of them should bite the new dog. They would have to answer to her. She's also my puppy raiser and teacher of all rules of the house. I love that dog.