Guys, Doggie SF growled and tried to bite my foot today. She was trying to get at a ground squirrel or something and I used my foot to push her back and she growled and tried to bite my foot. She knew immediately that she mumped up and backed away as I alpha'd her ass to the house and she ran into the kennel. It wasn't too bad, but I had hoped she was over being from the streets. She did this a couple of times with food when we first adopted her, but is loving and sweet as crap 99.9% of the time. She just has that part of her past still in there I guess. She is my first adopted dog. I've normally gotten a pure bred lab that I could have choked to death and they wouldn't even get mad about it. It wasn't too terrible, but I worry a bit about the kids or worse, a neighbor kid. She has only done this a couple of times during specific situations like this, but I don't know. Should I be worried?