Here's a video of a screaming pug that I found on youtube. Oddly enough if you type "screaming pug" into the youtube search bar you'll get 62 videos. Even more impressive, the same Google search gets 347,000!
Why is this phenomenon of the canine larynx so wide spread? I don't know the answer to that but Pugs are definitely bark impaired. Dudley sounds a lot more like a turkey than a dog whenever he tries.
Now watch. Dogs don't care if you laugh at them so have at it!
This is just one of the plethora of pug noises that are out there. Check some of them out, you won't be disappointed.