you can simply go to any exchange that has DOGE/BTC pair and can get btc easily. ex. yobit, poloniex, cryptopia
I've exchanged around 45k doge to btc in yobit. with no issues.
Thanks about advice of the Poloniex... I exchanged all my rest DOGEs and am satisfied now. I lost maybe half, but still am on the 4x more value for what I bought them before 4 years. Thank you all guys. An firstly I tried to use bter before 4 days but wait a long time for ID verification which is still in the progress. Poloniex work flawlesly.
BTW there is a LOT of scammers I got maybe 10 PM which shit like "send me doges i need it to pay rent" or "sent me doges i sent you already bitcoins look to the chain" and other "send me doges or I will report you as scammer" I may only smile. Once this peoples know someone got you, they simply trying to get his own piece of cake too hahaaha

.
Thank you all.
and to SCAMers: dont sent me PMs and go to hell I will not reply, you wasting you fucking doggy anus styled life. Die in hell.
look like (worthyou) got the most expensive wallet, his wallet cost him 0.01 btc per transcation. woWoo!!!