I just went through this experience with Ziggy. Please be aware some pugs have their anal glands too deep, where the normal method of squeezing the anus with a paper towel doesn't work. After taking Ziggy to numerous groomers none knew how to deal such situation.
I am including a video from youtube that help me express his anal glands properly. If you will be doing it on your own, you'll need a latex glove and a bit of K-Y jelly. To me this was the quickest method and most assured that you'll empty out his anal glands (have some aerosol close by because their fluid REALLY STINKS.)
You are welcome!! I am not sure if you have heard that solid canned pumpkin alleviates the anal gland issue. I personally have not tried it, but will definitely do so. I did a bunch of research on this topic yesterday because as mentioned, we just express Ziggy's anal glands and he continues to leak. I guess the fiber in pumpkin makes their stool harder and causes the anal glands to be emptied. Twirly the administrator, created an interesting discussion about anal glands. Check it out, it’s very helpful!!