I'd also want to point out a couple things.
For Raccoons: The fight against Don can be pretty easy. Ever Heard of the skill "Super Hips", well if you haven't, it blocks ALL criticals from monsters within 99 lvls your lvl. Also, most Gambler-To-Be Racoons are supposed to have lvl 10 Skunk Pouch. Lastly Galder Thrower is pretty good too, only use it if you already had it.
For Dark Dragons: The fight can be rather easy too. IF you have Hell fire and Wicked flames, taking him down won't be hard at all, Keep in mind that while Don is receiving DoT from Wicked flames, he'll chase after you, even if you're not within his range, so just run and run madly.
Hope that helps.
Best feeling in the world?
Drowning in your own sweat from doing a good job.