The log files say:
8:29:59 INFO]: Client> [08:29:59] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:mob.rabbit.hop
This leads me to believe that rabbits are supposed to have sounds, however the game cannot find them.
MC-59962
Rabbits have no sounds
Resolved
Fixed
0
(Unassigned)
Confirmed
Minecraft 14w27a, Minecraft 14w27b
Minecraft 14w33c
Retrieved
the sounds aren't added yet.