Well, maybe we're just both really good players then.
Truthfully, though, I hit any mage or priest with the felpup and a Curse of Tongues immediately, and rarely see a spell go off afterwards. Just lots of running around in a circle. The felpup usually gets them so good that I can actually replace the Curse of Tongues with Agony and start stacking my DOTs.
Now if I've got another pet out, the scenario changes. Having an imp out when a mage start spamming me from behind sucks, for instance.