I am starting to get totally frustrated with the two dogs we currently have.   I have a Westie (Poppy) and my daughter has a xJRT Border Collie (Pickles).  They bark incessantly, whether they are together, seperate, in earshot of eachother or out of sight of eachother, when we leave the house - even though we leave them with treats, when we return - even though we try and ignore them for a bit then greet them.  One of them is in the hallway thats Pickles and Poppy is in the front room.  They both have a substantial area to roam and they are extremely comfy. They interact with eachother under our supervision when they are both on leads. Otherwise they are seperated by a baby gate.  Its just sooooooo frustrating the noise is horrendous and more often than not i end up putting Poppy outside - and she still continues barking.  I have tried all sorts but to no avail.  I am seriously considering anti-bark devices. I must admit there are times when they are both quiet, lovable, playful pups but this seems to few and far apart.    Any help would be appreciated and i am no expecting a quick fix ...

difficult to explain without seeing it done.  I have a particularly vocal breed and one usually starts the other one of but you can teach the 'quiet' or 'no barking' command. 

As you do get quiet times this is when you can concentrate on rewarding the good, quiet behaviour.  I taught the 'no barking' to both dogs at the same time and reinforce it, probably weekly.  When the dog is barking keep quiet, don't shout at it or tell it of.  The minute you get a quiet second reward with treat giving the command quietly 'no barking or quiet' whichever suits you best.  Keep watching your dog because the barking will probably start again in a second or two, repeat above maneuver.  When you are getting good at treating at the quiet moment introduce a hand signal which goes along with the 'quiet'.  I hold my hand out palm down a foot above their heads and give the 'no barking' command softly.  To make it work you have to have your dogs attention so perhaps you should teach the 'watch me' first. 

When you dog is giving you its full attention looking you in the eye say 'watch me', and treat the very instant it looks you in the eye.  Working like this you begin to get the dogs interest and you can work on lots of training techniques.

Both this training methods are great when used with a clicker but that is another thread