Some multipools convert automatically to BTC, and some don't. Middlecoin, for example automatically converts your earnings to BTC.

I did get multipool and middlecoin mixed up. My mistake. I was mining doge directly for a while but I quit to mine litecoin two weeks ago or so because that was much more profitable. I was actually making much more money mining litecoin rather than dogecoin. That might have changed because I heard the exchange rate went up a couple days ago. After mining litecoin for a week and having the best luck with that I moved back to a profit switching pool, hashcows, to see if they will be more profitable, even though they had a sql injection attack lately. I wanted to see which was going to do the best for me. I haven't even been home to change my miners even if doge is more profitable right now and I have to go on travel. So far litecoin and hashcows are about the same in profitability for me as of lately.