What kind of wallet is that? I used Dogecoin qt-wallet years ago and also did some mining as well. I never seen this though, must be a new one. This looks like an online wallet, I don't feel confident about these type of wallets. Better have your private keys and stay offline if you can.
You shouldn't buy DOGE for high price though, it was less than one cent months ago, now it's more than 5 cents. The coin price works on speculation. The risk is too high for this price.