Stupidly over-engineered non-solution to trivial problem
Or, like, they could just put little wireless webcams on the dogs' collars, and then when one starts barking the controllers could just, y'know, LOOK and see if anything's going on.
Of course, that would have the disadvantages of being far simpler, cheaper, made out of bog-standard off-the-shelf robust and reliable technology, with a much-nearer-100% accuracy rate. But hey, why do things the easy and effective way when you can do them much worse, for only far far far more time, effort and money?