Your puppy will initially feel jealous and confused when you bring home a new puppy. Introducing the two puppies will probably be the hardest part of having two puppies, so you just need to get this out of the way. Once your puppies are introduced, it should only take about a month for them to get used to each other. There are steps you can take to make the introduction process smoother.
Take your new puppy to the vet and make sure he is de-wormed, up to date on his vaccinations and in good health before introducing him to your other puppy.
Introduce your two puppies in a neutral place away from the home. You could ask a friend to take your new puppy on a walk while you take the other puppy on a walk, then plan to meet somewhere. This ensures that both puppies will be on leashes, which is a good idea when they first meet.
Let them get to know each other. Sniffing, growling and barking are all normal parts of the process.
Bring your new puppy home but keep him in a separate room for a while. Your puppies will be able to smell each other and recognize one another’s scents.
Purchase new toys and treats for both puppies.
When they interact in the house for the first time, make sure you are there to supervise the entire time.
Spend time with each puppy individually for 15 minutes, then establish a routine that involves the two of them together.
Treat both puppies equally. For example, when you give one treat to a puppy, make sure the other puppy gets a treat too, or when you pet one puppy, make sure you spend equal time petting the other puppy.