Well I think I had the collar on to tight or something. My baby had been wearing it for about 2 weeks but kept loosening it so I would readjust it each night. It never really stopped the crowing but did quiet it. But Monday afternoon I found him dead in his coop. I've been crying ever since and I'm so heartbroken. I feel so terrible thinking I may have inadvertently choked him. Please be careful if you use a no crow rooster collar!