For what I know btcDragon accepts burst, vdice has dapps-like gambling and accepts vslice and Jetwin is sort of accepting altcoins (it is stated that one can play with one's own altcoin there, but I think this information needs to be checked).
There are some casinos accept altcoins, let me give my favorite casinos list that accepts altcoins:
1. Fortunejack: dash,ppc, clam, xmr, doge, ltc, nmc, nvc, zec, rdd,eth
2. Bitsler: doge, eth, ltc. burst
3. Crypto-games.net: dash, doge, eth, grid, ltc, xmr, ppc, strat
4. Luckygames.io: it accepts 40 cryptos, you can check it on their site
5. Bitdice: doge, ltc. eth
6. bitvest.io: ltc, eth
Actually there are some others, but above sites are my favorite.
Thanks! That's a good list as we can see both casinos and currencies there. What's more, from your list it's clear than even though dogecoin is not developed and is slowly dying as a currency, it is still used in gambling.