See she's only 25 pounds but is almost or totally full grown…so a Staffordshire or sheperd seems extremely unlikely. She also doesn't really have the build for that kind of dog...she is slightly broader than a Basenji would be, especially in the middle, but isn't super muscle-y. I agree that the Basenji doesn't really translate in photos well. You'll have to take my word for it that when I hold her ears up, that combined with an almost constantly super-wrinkly forehead (that isn't in all of the pictures, I know) makes her face look very similar to a Basenji's, though I know that doesn't automatically guarantee what breed she is.
I honestly don't know how the Humane Society and their vet staff determine the breed but I would like to have a little faith in them since they are normally very accurate and specific and hope that they would get at least one breed right in her mix (and again, I'm not finding any traits of an ACD)
Today at the park she was pointing a lot and her bark is similar to a beagle's so we're starting to wonder if she has beagle or some other kind of hound in her. It would explain her build and the fact that she has a very subtle outline of darker fur above her eyes. Or who knows, she may just be a through and through mutt with all kinds of breeds in her heritage Like I said though, I'd be very surprised if this particular Humane Society was that blatantly wrong about her. We're not too concerned regardless so while a DNA test may be in the distant future just for fun, we will probably stick with just getting the vet's opinion when she has a check up this week.
Thank you for your opinions!