Dogecoin differs from Bitcoin's proof-of-work protocol in several ways, one of which is by using Scrypt technology. The altcoin has also a block time of 1 minute, and the total supply is uncapped, which means that there is no limit to the number of Dogecoin that can be mined.
You can [mine Dogecoin] either solo, or by joining a mining pool. A Doge miner can mine the digital currency on Windows, Mac or Linux, and with a GPU. As of 2014, you can also mine Litecoin in the same process of mining Dogecoin, as the processes were merged.