50% aren't blowing coat, they're just back in full coat. The other 50% are out of coat just starting to add coat. They should all be in full coat if I bring some to The Potomac. That's IF I want to go broke given certain circumstances.
Once they start blowing their coats there's really no stopping it. To get it over and done with I give them all a nice bath and scrub them with a rubber curry brush. That messages the skin and loosens all the dead coat, I then use my grooming dryer and blow out the coat so that the new coat will come back quicker. This is what works for me....Good luck!