It is unfortunately impossible to know those numbers. This is due to the fact that some people do not admit that they have them, records are not kept on dwarf foals born, aborted or anything by the Assoc., so there is no way to know how prevelent these types are. I do have my educated guesses, but I will not give those out specifically with regards to the populations I have dealt with, meaning breeding programs. This is because it is so subjective to only those horse populations I have dealt with, so those numbers would be skewed and not reliable to a population as a whole if you want me to include the horses up to 38" that have "some" Shetland close in their pedigree.
I will say this, with including all of these 4 dwarf types combined in the total population, and knowing the inbreeding done in the past and now, I would not be suprised if it is involves 1/8 to 1/2 of the total population, including those up to 38".
John
