Thank you for your question. Assuming someone in your family or friend did not place the snake skin in your dryer, then the snake most likely entered through your dryer exhaust vent and then the dryer hose. This is the first time I have heard of this happening. Usually, the problem involves birds building nests in the vent or the dryer hose. 

If you want to see if the snake is still in the dryer, you, or somebody, will need to disconnect the dryer hose and check to see if the snake is still in the hose. I suspect, though, that it crawled back out. You can prevent this from happening again by placing a screen or grid cover over your vent. You can usually get these at any of the big box home improvement stores. This will keep birds and snakes out of the vent, while still permitting adequate air flow through the hose.

I hope this information helps, and thank you for contacting Ask an Expert.

Jim