Bests & Worsts Reviews from Amazon

This came highly recommended, so I know it works for some dogs. Unfortunately not the case for mine. Within an hour of putting it on my dog she threw up the entire contents of her stomach. Later that evening she wouldn't eat any dinner. The next morning she wouldn't take the treat that she always gets and begs for in the morning and she wouldn't eat breakfast. That evening, after 30 hours without anything in her stomach, she ate some dinner. Four hours later she threw it all up. I took the collar off at that point and she is back to her normal happy self. No doubt in my mind the collar was the problem.