Wolves usually howl when the player is within a certan distance, but your usually far enough away that they won't attack yet, Listen for the howl, then stop and find that wolf before it finds you. Thats how I deal with wolves myself. As for the zombie dogs, those things have always been damn ninja's for as long as I can remember.
Now if you mean the wandering horde of dogs or wolves, yeah they need to make more noise. Another problem is the background ambient that plays in diffrent biomes, doesn't really seem to have a volume slider for it, Ambient sound, or music does not effect it, only master volume does which makes everything quiet. The game really needs more detailed sound sliders. Its missing player/zombie sound effects, and various other ones most games have. In most biomes this ambient music is so loud it drowns out other sounds which is also part of the problem with the ninja zombies etc.