Sharron, all I can say is that he does not have fanconi,,
Here is a quote directly from these postings:
I spoke to Geoff Sampson at Crufts and the KC has no plans to include Fanconi testing as a noted health issue. They don't normally take action until an actual gene is isolated as there is no telling whether it is for a disease or merely a tendency to the disease (as some genes for a tendency to cancer, for example).