If we are talking about chromozomes, then CsW is 100% wolf as are other breeds
I don't think that the wolf blood percentage has any except romantical value at all.. Percentage of "wolf genes" are better seen in the bonitation code - the less letters your dog has, the more genes he has which "belonged" to wolf.
By the way, Charlie, the recombination (crossovers) are going on at every meiosis, meaning during the production of every egg or sperm. Only most of our DNA is either junk or very similar (or both), so it is not seen very well. Chances, that a "wolf gene" gets on the "dog" chromosome by cross-over are quite slim, so well, yes, you can leave them out of general counting.