Two dogs living together?

[Ugo]

Fishhawk, does your female convey a strong dominance around other dogs now?
There is often an adjustment period bringing in a new pup however if introduced properly/calmly without your body indicating a concern, there should not be one.
What I see too often is that, because puppy is so cute, folk tend to forget about the older girl. ALL treats should be provided to the older girl FIRST. Greetings (if you've been out) are directed to the older girl FIRST, etc.
Monitor feeding, chew toys, etc. I'm sure you'll do just fine.
Oh.......and make sure you get a pup where the sire/dam are "grounded" too. Edgy sire/dam often means edgy pups.
I hope you used a crate?
The intro should be done gradually. Introduce them in a neutral place - NOT in your home! Take a short walk with both (get a helper it's easier.) Hierarchy will develop by itself over time. This is natural, as long as you are calm and in control throughout the process.
Feed them separately (hence the crates) at least at first, until you determine how well they get along.

[Pigeoneater5000]

My wife said she would kill me in my sleep if I brought in a second one. Not gonna test her on that. Not quite yet anyway.

I feel your pain.

[MikePal]

There is often an adjustment period bringing in a new pup however if introduced properly/calmly without your body indicating a concern, there should not be one.

Great post...bang on, it's all about the pack behaviour.

We've always had multiple dogs ( up to 4 sometimes) and we have never had any serious problems introducing new dogs to the pack. They sort out things themselves. Thru the past few years we've introduced a Shih Tzu and a Jack Russels into our large breed family and they fit right in.

Remember a 'skirmish' between dogs is a normal behaviour and it will happen occasionally, it's how they teach/learn, not unlike humans