Joey, my chi, Toots all the time. And when he does it, and it makes a sound, he always looks back at his tooshie like "what was that"! His doesnt stink too bad.
Dora the Yorkie does ALL THE TIME! ESP. when I first got her and she had coccidia. She could clear a room within seconds! BUT no noise
One of my kitties, Hannah does almost everytime I pick her up, and it makes a cute little sound, LOL.
Another kitty Puff does, and you cant hear it, but WHEW! You can absolutely smell it!