its funny you should mention a boxer collie mix because that's what our other dog his. We seen both parents, his mum was a boxer and father was a border collie and although they look somewhat similar, she is a lot more slight than he is and her face is totally different in person.I googled "Collie Boxer mix" and actually found some dogs that look similar to her! She may have another breed as well, because she's not as heavy set as the dogs I found, but she's still young so may fill out. But I was surprised at how similar these dogs look to her!
Cedar Run--Critters (3rd picture down)
Jule (Border Collie, Deutscher Boxer) | Mischling - Mix (They're saying Border Collie Boxer mix)
This one I'm adding because he looks awesome! But they don't know his breed.
Makco Marketing Inc. Photo Events | Elton's Studio Portraits | Photo 19
Yeh I see more whippet than greyhound because of her size and im guessing she is crossed with some sort of mutt aswel. Whoever both parents were they done a great job haha - prettiest little lady!that coloring happens in whippets sometimes- fawn, black mask, white markings:
I too see a lot of whippet in the build, ear set, size sounds right and even color. Maybe she's whippet mixed with a generic medium sized, light colored mutt? I just don't see another breed that seems to stand out in her. I would say maybe shephrerd/lab/whippet but she's so small for that. I was thinking maybe boxer but her face is so long.