If you breed a wild colour with a snow all of the babies will be normals and carry a copy of each of the genes to make anerythristics and amelanistics. So here's the scenario
2006: breed dogether snow and normal, retain a male and a female baby.
2009: breed together those 2 babies and you can expect normals, amelanistics, anerythristics and snows (anery and amel) to result from this pairing.
That's a VERY simplified explination.