i know it sounds CRAZY, ( and too late for you know, unfortunately) but i started painting my pugs toenails when she was just teeny teeny. Now, clipping her nails is a snap because she's used to having her feet touched.

But, on to you. When I was a vet tech, this is what we would do for dogs and cats that severely protested to the trimming. GET TWO PEOPLE to try this.
*Get a towel or blankie and SWADDLE your pug, slightly covering their head (so they can't see who's doing the clipping or holding) exposing the target leg.
*HOLD ON TIGHT. It might take a few tries to get puggie wrapped up snug enough as to not be able to squirm out. You are NOT holding too tight, but try not to compress the chest as to cause panic by difficulties breathing.
*Clip quickly, but obviously not too short. Have the Quick Stop handy in case you cut too deep. It does hurt when this happens, not to mention bleeds like a slit pig.

It might be too late to get your pug to sit still on its own, but this way you might be able to avoid a costly (and traumatic, due to the association of nail clippings) trip to the vet just for this.

Good luck!

Me too, as a city dweller, I never had to cut my pug's nails! The pavement ground down his nails and took care it for me. We took long walks on the sidewalk every night! A mile or more in the spring, summer and fall, in the winter his nails were not long enough to worry about!