Is there a difference between “noisy” and “silent” farts? In all seriousness, what is the difference between them? Is it random? Is it chemical? Is it physical? What causes it?
Mostly it has to do with two factors: the tightness of the anal sphincter and the pressure of the gas behind it. The tighter the sphincter, and the higher the gas pressure, the noiser the flatulence. If anyone else cares to speculate on the factors that affect sphincter tightness, feel free. This is as far as I go! 
I agree.
If you blow air slowly into a trumpet without puckering your lips, the air wil just flow through without “trumpeting”.
If you pucker up and increase the air pressure, you will get sound.
Why is it that dog farts never make noise?
I agree that flappage is key to the equation. Maybe dogs can’t hold farts in very well and they never have to chance to build up enough pressure to do the anuslap.
My basset hound sometimes farts going up the stairs, and the farts literally squeak out. So I can’t say dog farts “never” make noise.
I can’t believe I’m contributing to this…
My dog’s flatulence varies as much as mine does. Sometimes silent, sometimes not. But what’s fun is to call her on it and watch her get embarrassed (anthropomorphizing, but there is that kind of reaction).
ROTFLMAO*
IDBB(who just finished reading the other fart thread and is still crying with joy and lusty fartations*
my dog farts loud sometimes. not as loud as a human but audible.
You haven’t heard my Great Dane! Rattles the windows sometimes…
Ok, we’ll quit with the hijack.
All farts are silent if you’re Deaf. However, the reason they stink is so that the Deaf can enjoy them too.