Warwick can solo dragon at level 3...
Follow this pattern:
Get blue, you don't need a leash (seriously), go to wolves, go to Gromp. You are level 3. Walk to the dragon. Smack dragon. Smite the dragon at around 75% health. Continue smacking dragon.
You will have officially just gotten dragon at level 3. Now go forth and relish in this delicious balancing.