You said it was the "easiest" way, which read to me like it was a suggestion!
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Anyways, when leveling my sham 34+ with a standard "disease dot, root, slow, pet, poison dot, optional nuke/poison dot depending" sort of method, I found that only rarely could my pet steal exp. This was when 1) he was hasted (and usually str-buffed too), 2) he was a high-level summon for the pet level, 3) I had just moved to higher-level monsters to fight but without getting new dots. When I first noticed this I just took the easy route and stopped giving my pet offensive buffs. Saved me mana and attention to haste timer and ensured he wasn't going to steal exp.