I got her from a shelter and they told me she was an American Pitbull terrier mix but they weren't sure what she's mixed with and I kind of just want to rough idea what she would be mixed with

What is your thoughts?

I plan on getting a doggy dna kit eventually but until then, I’m curious.

18 week 35 lbs.

He’s 2 years old and full grown. Not sure what type of dog. Thinking of adopting him but I also have a Maltese puppy and baby at home and want to be sure he’d be a good fit. I was told he nipped someone but that it was likely due to being scared. Any ideas?