5 Dire Wolves

I finally bought Erase Magic. Question: Is the rule for amount of monsters one can tame also cha + class bonus / 6?

Well take a look:

I took them to DI to see how they would do against Nightmare. They get killed in one hit...
I died to nightmare, but I stayed on the ground to see if I would still get drops. Haste potion and blinding potion. =(

After two nightmares, I only had three dire wolves left. When the sixty minute timer was almost done, I dissolved them and killed them. One of them pulled a bdai from something like two mages, two elves, and a dark elf. Nice doggy ^^