My dog barks at other dogs and it is getting steadily worse. She doesn't growl but she pulls towards them and she is loud-she is spaniel sized but barks at all dogs of all sizes. It is hard to find people with dogs to socialise, but when I do she can keep the barking up for over an hour. We separate the dogs till the barking stops and then we walk behind the other dog and for a while she is fine. Then she starts again. Originally she only barked if in close proximity-now she will start at 20 feet.Any advice would be very appreciated