<human>: Can you give me the gist of the text in a nutshell?

Hey /r/dogs! I need some help/advice.

Last Friday, my SO found a puppy on the interstate by the office he works at. She had had two older, larger dogs with her, but they ran and left her behind. He waited around to see if the other dogs would come back for her, but after about an hour, they hadn't returned. She was incredibly thin, dirty, and her collar was all torn up. So we took her in for the weekend!

We took care of her, and I posted everywhere to try to find her owner. We put in a slip at the local shelter with her description and her contact info, I posted on Facebook, Craigslist, and Instagram just in case it would reach out to the owner somehow... but nothing. No one has reported her missing, no one has said anything except, "if you don't find the owner, I'll take her!" She hasn't got a microchip, and her collar had no tags whatsoever. 

[This is what she looks like, now.](

We want to keep her. But, we live in a small 3rd floor apartment building. We don't know quite how old she is, but she still has those tiny puppy teeth, and she's still getting used to potty training. We don't know what breed she is, exactly - she looks to be part black lab - so we don't know how big she'll get. And soon, both of us will be working during the day, leaving her alone for a couple hours.
<bot>: took in a puppy off the streets, want to keep her, not sure if we *should*. Nowhere to burn her excess energy, won't get enough attention, it's an apartment building... I don't know.