Any tips for putting blankets in the dryer?

When I put blankets in the dryer, they always curl up like a ding dong and the middle stays wet. How can I avoid this?

Throw in some tennis balls. Or shoes, if they’re heavy blankets.

Either put tennis balls (or some other light, largish ball that will bounce around and keep them from balling up) in with the blankets or time dry them around 20 minutes at a time and shake them out between sessions.

Clothesline might be a better option, too.

How do you place the tennis balls? Should I shave the tennis balls to avoid the tennis ball fur?

edit: Also, how many?