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?
Hey okay so this is wild but I figured I wanted to reach out! So I rescued my pup and his siblings from Puerto Rico after hurricane Maria and we have always wondered his breed. We know his mom is a chihuahua mix but it wasn’t until today that I realized he might be mixed with Basenji. I came across your post because we were trying to see if Basenji’s were even in PR. Do you know what city your little guy was picked up in?
The traits you described are also found in most of the Nordic/spitz type dogs. I don't see anything overly basenji-ish about him in the pics. What ever he is, he's very hansome.
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! :)