I just wanted to also add that alot of these collars or devices are band aid fixes that do not always work. Infact, the dog's behaviour can manifest into 'new' undesireable behaviours as a result.
We do have an expert here at Pets whose name is Tenderfoot. She may be able to help you pinpoint what type of behaviour being exhibited and how to remedy it. The most important thing is finding out what the root cause is before it is addressed.