We are thinking Spike might be a Basenji Terrier mix. He definitely has the basenji personality and the bark. We love him no matter what he is but we are curious.
I can see why someone would think there was Terrier, but I'm not so sure about Basenji. (The only way to know for sure is to do a DNA test.) Both of your dogs look very similar. What breed, or mix, is the older one?
I don't see basenji in your rescue - she is a very cute doggie, and there very well may be feist in her. A DNA test would tell you everything and it's a good investment; it would help you know her personality traits and identify her behavior as well.
She was only 16 pounds when I took her to the vet last but I know she is more now. She was also malnourished when we got her, she is gaining weight but she is still skinny.
I made a photo album with some better pictures. I'll add more as I'm still searching through pictures on my camera to find some side views.
But right now I'm off cause she is complaining that I'm ignoring her and not throwing the ball! :)
Look at the BRAT mixes:
http://basenjirescue.org/DOGS-MIXES/Default.htm
Check out Tia. I think that's what you are looking for. :)
Then look at Tyson and Shiloh. Not the right coloring, but similar build and coat….