Is this opinion formed from your actual experience? My actual experience is that they are actually successful at stopping nuisance barking that upsets the actual neighbours, when no other method could, thus saving my dogs from the needle.
Did you have your actual dogs from pups and did you spend actual time with them training them basic manners for example not to bark when in the kennel, every dog i have ever owned has learnt that time not spent with me is best spent sleeping. If you do inherit a problem older dog i dare say that with perseverence and patience and a little bit of underst