here is the thread with responses from vicki and val regarding all this - have you talked to vicki, val or jaimie as those three know alot about this as well as tami and give you alot of insight to it. The one thing i read is vets are not familiar with it if they have never treated it in a pup so may be why your vet is not labeling it AAI but he is saying C1 which is AAI as it happens in the C1-C2 area
http://www.yorkietalk.com/forums/sic...mic-shunt.html