She looks like my girl in many ways. So I'm going to guess the same mix for your dog, likely a rat terrier/beagle mix!
This is an old picture and her nails were terribly long back then, but I chose it because it's the only one I could find where she had her ears relaxed. The droopier of the two looks just like your dog's.
And CptJack, I don't know if I'll ever seek out a purebred, but rat terriers are my number one favorite breed as well.
EDIT: LOL, I just now noticed these are two different dogs. So I'm referring to the second image. Are these two dogs littermates? I almost see APBT in the first dog, but had assumed it was just the angle of the shot making it look that way when I thought they were both the same dog.