You had me confused and then I realized you meant the write up on the other rescue (Okapi)…
I like less white also. So I had to go look... wow, coloring reminds me of minpins. :) Cute dog though.
No idea, sometimes with mixes it's so hard to tell what the parentage is. I do think that your dog's head is a bit more refined than many of the pit mixes i've seen.
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….