Under 'Options > Music & Sounds' there is a slider to turn off the sounds that peaceful mobs make.
A cow's moo and its heavy footsteps are silenced, and that's great if you have a ton of them nearby. But you also lose the ability to hear a your own footsteps, or even a Creeper's steps from behind! (Not a very friendly mob, mind you...) Blocks like dirt, gravel, and sand don't make a sound when walked upon or while being mined when peaceful mob sounds are set to 'OFF'.
This is a bug that constantly has me switching between having this setting on and off.
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