Dry hopping refers to adding hops to the fermenting beer and letting them soak in it for a period of no less than 10 days. For the typical five-gallon batch of home brewed beer, one to four ounces is the appropriate range of hops to use.
Snakes shed their skin to allow for further growth and to remove parasites that may have attached to their old skin. As a snake grows, its skin becomes stretched. Unlike human skin, a snake 's skin doesn't grow as the animal grows. Eventually, a snake 's skin reaches a point where further growth is not possible.
If you have 4 skins, in my opinion, you have a nest. An exterminator can remove the snakes but you'll have to find out where they are getting in and seal it up. I saw some workers remove snakes and take them over 700 yards away form the house. The snake was back in 20 minutes.