Originally Posted by
CritterMom
Both of my squirrels have done this to a degree, and both of them have had it decrease each year as they aged. From what I can see, at least for mine, he doesn't molt out the winter hair correctly on the butt end of his body. It sticks around, looking kind of shaggy until mid summer when it gets thin and eventually falls out. Mine goes all the way to pink skin! Then late summer the fur starts to fill in there - always bright gray for winter, and everything molts properly and the winter coat is perfect. Then the following summer it starts again.
It isn't mites or a fungus. The skin couldn't BE any smoother (I grab poor Zeke and rub his butt against my cheek ALL THE TIME) and it is perfectly symmetrical - mirror images on both sides of the body. Hormonal? Maybe, but why don't I see wilds that way? The thing that gets me thinking is that the one thing neither of them ever experienced was winter temps, despite living in a VERY cold place, and likely being geared up to do that since they and all of their ancestors lived right here. They are little rich squirrels with nice warm homes. I think the molting in the spring is part of it and wonder if the warm temps prevent that from happening properly.