Ocelots and cats have hissing sounds in the files, but they aren't currently used in the game. In my superflat creative world, my cats were hissing at me as I passed by.
MC-28150
Ocelots and Cats hissing
Resolved
Invalid
0
Probably your sound files are messed up.
Quit Minecraft and Launcher
Delete
.minecraft/assets/soundRestart the Launcher