Dog Distribution System?

I’ve been hearing noises under my house for a little while and something was getting in my trash. I assumed raccoons or something until the other day my son went to the car late at night to look for his sister’s phone and saw a dog under my porch.

She hasn’t barked or really done anything other than whine a little. I called animal control and the shelter and the shelter said they were at capacity and would tell me I couldn’t leave her if I brought her and animal control just sent a cop out and he walked around and asked my neighbors if she belonged to them but no one has claimed her.

I’ve been leaving her some food and water and she’s a sweet dog. She will come to get petted when I go outside but she darts back under the house whenever there’s anyone else around and she acts timid, like she’s scared.

I reckon I’ll wait a little longer and if nothing happens, I’ll take her in but I was wondering if anyone could tell what type of dog she might be. She doesn’t have a collar and she has fleas so it seems like she might have been an outside dog previously.