Is killing *too* easy?

[Ran]

Hm, i suppose i was the only one who couldn't kill the dogs... I jumped up on the rail just after you see the second dog (when you open the gate), and hit the dog maybe twenty times with my pickaxe, but the dog wouldn't die, just lay still for a second, run away, and then attack me again.
I did however manage to kill a dog using the steam cages. But i reloaded a previous game. So, i've played trought the whole game on hard without being spotted more than two-three times ^^