While Kucoin is recently doing a lot of significant development and trying to get into the top exchange list which may be they will soon, they don't have Doge market. I didn't know that, I decided to have some Doge (why not, it's 23 satoshi), and deposited a little BTC on Kucoin. But they don't have the Doge, so does ABCC. It's not good, Doge is a huge market.
Not all the high valued coin should be available on all the exchanges and the exchanges might have their reason why not to add a reputed coin.
But if you want to buy doge with bitcoin you have lot of options other than Kucoin.