Barking

Hey Guys!!
Anyone know of any good bark stoppers, that aren't spray collars, citronella or shock collars as I don't like these methods and don't think they'll be very good for a pug! Lou is just over a year old and we got her in Aug this year she used to be a kennel dog an we managed to break most of her habits and she seems willing to learn! But her barking is just unbearable and she only does it out our backgarden never in the house or on walks, but once she gets started thats her we have tried a squirty water bottle which works on my other pug but doesn't seem to do anything to her, the hose scares her but i don't like the thought of scooshing her with freezing cold water at a force! She is a rather smart cookie though and only barks when she's outback with neither of us out there with her and shouting on her back doesn't work! Anyone got the same problem or has had and can give me a helping hand I don't want to end up at doggy court nothing has happened as of yet! Any advice would be appreciated!