D., the following is straight from the website of Hasbro Toys, the makers of Play Doh:
<<<HOW DO I REMOVE PLAY-DOH COMPOUND FROM CARPET, UPHOLSTERY, OR FABRIC?>>>
"When attempting to remove PLAY-DOH compound do NOT use hot water or cleaning solutions of any kind. To remove PLAY-DOH compound from carpet or fabrics, allow it to dry completely, and then loosen with a stiff brush. It may be necessary to vacuum clean or wash with gentle soap and cold water. You may need to repeat the process in order to completely remove the PLAY-DOH compound."
Good luck. Hope it works!
Just as a P.S. ...
If you are faced with a stain and don't know how to get it out, don't put hot water on it until you KNOW that is the correct solution. Hot water tends to set stains, particularly protein-based stains like blood. If you have a mystery stain and you wash it in cold water and it doesn't come out, you can still wash it in warm or hot water ... no problem. But, should you wash a stain in hot water and that is the wrong treatment ... you've just made a new scouring rag. Also, one of the greatest cleaning solutions I have ever found is called, Spray Power. It comes in a 1 liter spray bottle as well as a gallon refill. It works in your carpet shampooer and your washer, cleans grass stain and week-old blood stains (albeit with a bit of scrubbing!) Got a grease stain? Pour some on full strength and let it soak awhile; a little rubbing, then toss it in the washer.