51% attack is not so easy to be made.
Dogecoin is based on brand new litecoin source so its not so like in "early" years.
It's a scrypt coin nothing else.
If the price doesn't follow the hash increase miners will quit and those who aim at the 51% will remain , even mining at a loss until they make most of the hash rate
You don't need to throw 10 000 gaw miners at the chain at once , do it slowly and you'll manage the same with far less costs.
The question is , why do it at all?