Morgot's servants more terrifying than Sauron's?

[Formendacil]

Originally Posted by Huinesoron

So what of the dragons? We know Glaurung was able to affect people's minds in many ways, including warping their thinking, freezing them in place, and completely regressing them to a feral state. Could one of the great dragons deliberately induce fear in the same fashion as the Nazgul?

My gut instinct is to say that while it might be the case that Glaurung could, that doesn't mean that dragons in general could. My instinct is to look to Smaug for an idea of what a "generic" dragon could do (Smaug is certainly powerful, but he's not the father of dragons).