I don't recommend a bark collar for a reason you may have never heard of. When I got my dog, Autumn, I still lived with my parents. My stepdad wouldn't tolerate any barking so she had to have a bark collar. Autumn quickly learned that she could get away with a loww growl without getting shocked (BTW, the shock doesn't hurt that bad, I've tried it). Anyway, now she still greets people with a growl and uses a growl more than a bark. This is not an aggressive thing on her part, its just that she learned that a growl was all she could do without being shocked. This scares people and could be dangerous for her is she growls at somebody who takes it wrong. She hasn't had the shock collar for years but still growls before she gets up the confidence to bark. Sometimes she still acts like she's expecting a shock after she barks.