I've only had the collars for about 3 weeks so at this time I can only speak to the matter of loud noises. We've had two thunderstorms since my dog has had the collar. Whereas before the collar, she would have come running to be comforted, panting and possibly shaking, she didn't pay any attention to the thunder other than maybe raising her head to look around with the first thunderclap. My other dog came running to me and needed reassurance. The only different thing was the collar. I'm very pleased that it is working for that.