He looks pretty full breed to me, just not to "standard" with that extra white. Is he ridgeless? I've seen full Ridgies that look a lot like him. Here's a picture of my Ridgeback Play Group.
over 2 years ago, they have revised the WHITE, it is not undersirable, any more i have seen many RR's with what you would call, too much white, champion.
it's all in the conformation of the dog.NOT THE COLOR
the ONLY D Q is no ridge, a missing or more then 2 crowns, except for, i have bred and championed RR.s with a small swirl ontop of the head. also, saw an amazingly beautiful dog, ridge going down his front side,with also having a beautiful ridge on his back, take a best of breed, he was that well put together!!!!!! this revision comes from RRCUS
a bit more white does not take away from the beauty of the ridgeback, actually, it can really look beautiful, and very flashy looking in the ring. i guess we are going back to the original type color of the african ridgebacks. this is wonderful, so many show prospects were sold as pet , because of white, yippie for our whit footed ridgebacks!!!!!