Yes, DOGE can be borrowed and then sold, to be repurchased later (at a possibly lower price); short positions can be opened. Plenty of DOGE is available for sho

Yes, DOGE can be borrowed and then sold, to be repurchased later (at a possibly lower price); short positions can be opened. Plenty of DOGE is available for shorting. GPUs currently mining Ethereum can be used instead in a 51% attack against DOGE. No such pile of resources exists that can be redirected to attack Ethereum or Bitcoin.