I was a Peace Corps Volunteer in Togo and I brought my bog home with me. As far as I can tell, he is a Basenji. He doesn't have the typical curly tail, but he has quite a few of the other characteristics. He makes the same sounds as a Basenji when he is annoyed or excited. When he wants to bark at something, he makes something similar to a howl which undulates in pitch. He does make a bark of sorts. It sounds like a muffled "ruff" and he won't do it again for a few seconds.
I thought you guys might want to take a look at a West African cousin of a Basenji.