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?
@katoman Hey, you should really try to relax some! You jump to the defensive all the time!! This is a forum......it's for everyone to voice their opinion!! You're not on trial here! It's really pretty interesting when a bunch of people start voicing their idea's & opinions! You're not going to get sue'd because you bred your dogs (at least not by any of us & doubtfully by the folks who bought the pups!). I bet there's a happy guy in there some where ~ let him out for awhile! Okay? It's easy to get along with most everyone here!!
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.
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….