The reason for the large number of transactions is that so many people are mining Dogecoin. Most miners automatically sell their mined Dogecoin for Bitcoin, and

The reason for the large number of transactions is that so many people are mining Dogecoin. Most miners automatically sell their mined Dogecoin for Bitcoin, and new Dogecoin blocks are mined roughly every 60 seconds. Several pools have as many as 6000+ individuals currently mining it. Really the only thing preventing the transaction number from being even higher is that most pools only give out accumulated awards to their members every 30 minutes or so (during which the pool may have mined several blocks).