I rarely see any of my dogs down from Frosty ever fuzz up. The one thing they do is just drop their tail about 20 minutes into any activity. It just hangs there, relaxed. Now, there are a couple of dogs here from different breedings that fuzz up at times like has been mentioned here. I've seen them fuzz when excited, and I've seen them fuzz when they get into serious trouble. I've seen some fuzz right before they pack it in. Whether it means anything to one person's chosen dogs or not is based on that person's personal experience. If my dogs from Frosty suddenly started having fuzzy tails, I don't know what that would mean as it's something they simply don't do.