I am not sure if dogecoin mining is possible, maybe some exchanges are offering it but no such concept actually exists in dogecoin because it works on proof-of-work as we can mine dogecoins using hash power. My sincere suggestion would be to avoid staking coins because any exchange can turn scam any time and you don't have the private keys then you are not the owner of the coins.

I had some coins in bleutrade and a few small exchanges while others ran away with my coins, Bluetrade is still running but they have stopped replying to me and my coins are locked under them. I have few hundred dogecoins there and I left it there because it was not much worth back then but now I regret even leaving dust there.