Are you slowing the mobs? If you're not they will chew through your summon pet.
use this:
http://wiki.project1999.com/Languid_Pace
Also make sure your pet is hasted.
use this:
http://wiki.project1999.com/Quickness
East Karana is the #1 spot for enchanters at the level 17 range. You wont even need a pet if you know what to do.