Any thoughts to what breed, or mixed breeds my dog might be?

I've recently adopted a new dog from a lady. I have had her now for 3 weeks. She is a very delightful little dog. I have never seen a dog take to a child so well. She instantly bonded with my son. With me too. She gets along great with the other dogs. At first I thought she did not bark at all. But I heard her in the back yard.yet she doesn't bark inside the house. She is supposedly little over a year old. Her teeth are very white. She is wire haired, medium length. Her ears are erected. Her muzzle is in the shape of a wedge. Her face is much darker than her body, except for the touch of white around her nose. Her body is brindle, with white patch on her chest. She also has white booty feet and a tip of white on her tail. She is small. Her chest bone seems to protrude. I have done a ton of research on the web. She looks a lot like a Portuguese Podengo, except for her coloring. Because brindle is not an accepted color for the breed. She also has the strange ring of fur / hair around her neck. Plus the Portuguese Podengo is pretty rare in the U.S. Her vet thinks she is a cairn terrier mix. The lady I got her from, said she was told she was a westie mix. After researching them both. Come to find out that both the cairn and westie are from the same line. According to what I have read. I just don't see the Cairn in her. Or the Westie. Anyone have any thoughts to what she might be?  

My profile picture is of her.

Thank you for your input.
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