"Sound detect" option is for crying baby voice. There is no option for "barking dog". I did not try "sound detect" option on my dog. It may or may not work... But, "pet motion detect" works pretty well.
Besides, sending/recording voice messages to your dog over this camera will not work to calm down the dog in case your intension was to "silence" the dog. Because they realize if the voice command is from a real person in the room, or is it from a speaker. Yes, they are clever animals...