Clash-of-clans – Introducing Dragons to Attack Composition

Yeah, inferno towers are the hounds only real weakness so most TH9 bases will be relatively easy. Rage spells are always important. A clan castle with some extra minions is encouraged, but is technically optional against TH9. High level heroes are another aspect that would be quite helpful but is also relatively optional, much more so than a full CC in my opinion. To sum it up, yes that army comp will work, it mostly comes down to individual strategy, especially your use of rage spells, as well as the enemy base layout.

EDIT: I also forgot to mention that high level troops are very important. In my opinion loons are the most important, making up the core of your strategy.

Dragons should be drawn out and surrounded by units that can attack air like wizards, archers, minions or dragons. If you lure them out, they are generally quite easy to defeat with minimal casualties. The real problem is if the clan castle is centralized, making it very difficult to lure out without committing a number of troops. If that happens, heal/rage spells work quite well at preventing losses and quickly defeating the distraction.

EDIT: Drawing out clan castle troops is done by placing troops in range of the clan castle, causing the CC troops to come out of the castle. Afterwards, you place just one archer far away from any defenses, such as a builders hut in the corner. Once the dragon gets to the archer, surround the dragon with wizards, minions, etc. and they will quickly defeat it with only a few casualties.