To help four hunters from my guild tame their core hounds, a bunch of people went to MC yesterday. So I can give you some information on how it goes. Firstly, my epic'ed out tankadin did not take any damage from the MC trash. You still have to look at their abilities - like the ever multiplying adds for the fire elementals that you have to kill - but they are essentially weak because they keep their level. For a level 61 hunter, they area definite problem though, you will need help. The mobs have about 120k or so health, so will take some burning down and are impractical without a tank.

What it gets down to, is that you want a tank, some dps and a healer with you. To get to the first core hound's patrol path, you will need to drop four molten giants, three fire elementals and a fast patrolling rock elemental. Once that is done, you have a shot at getting a tame done.

The hunters on our trip were all level 70 and their health barely lasted through the core hound's attacks during the taming time. Here is how you work around that. While taming, you have to have to be the hounds target, otherwise it breaks. If you just run in and start taming, you are the default target, but if someone heals you, that causes threat and the hound runs off. What you want to do is shoot the hound a few times to get a few thousand threat points in, another hunter using misdirection on you and also shooting the core hound helps a great deal. This gives you about 7-10k threat. Which means that your party's healer can heal you for twice that much without drawing aggro or interrupting your taming attempt.