[Blacksheepaalredy]

hi,
so my family is looking at this pit bull puppy, female, spayed, 5 months, about 30+ lbs already.
Her history so far is that she was dropped off at the vet when she was 3 weeks because she broke her leg and the "breeder" couldnt make money off of her .

we own a male pit bull mix, we adopted him when he was 2 years old. We have had him for about a year or so.

So basically my concern is that, today we met the pit bull puppy (Olive) and she was Fiesty. That is expected out of puppies though right? She is growling and clinging on to my guys jaws and cheecks, but my dog is very patient with it. They started playing after a while of her barking and growling at my guy. My guy was ignoring her. But then eventually they started wrestling. But okay sorry, back to the point. She was bred in a bad area of the city, and they were telling me that she had issues at first like they couldnt put her on her back and biting everything. (But I kinda expect that since she was taken from her litter at sucha young age she couldnt properly socialize right?) and right now she is being fostered with 2 female dogs one rottie and the other austrialian shepard. she met cats she was fine with the cat, ignored it. Met other animals like rabbits and such and was good with them.

Also, she pees when she is excited like when someone comes over, I researched it, it said it could be a submission thing. But the foster family think she will be domaninat as she ages. My dog also can be domaniant depending on the dog of course

She still needs alot of work, she isnt a very good lsitener but i kinda expect that from a puppy btu she is like 5 months.

Sorry I am rambling but my main concern is:
1. her fiesty playing (will that go away over time?)
2. my dogs fighting over domanice as the little one ages
3. getting a second dog effecting my relationship with my current dog. (i have never owned 2 dogs before)

Any other insights to my situation would be great

thanks