I think this method is by far the best, Using a resto spec shaman that can cast earth shield, it has 10 charges and this method works all the way up to lvl 60 and never gets mitigated. I did it on a hunters pet from 54-60 on elites and questing and it rocked. Plus its sooooo easy to double box or even quad box, cast ES on one and create heal macros for the others. But a priest renew is almost as good