Neither of my dogs will eat these. I have to try to disguise them by cutting them up really small and hiding in other foods. Also, about 2 weeks of continuous use and I haven't noticed any difference in either dog.
It was very beautiful, BabyCat looked extremely smart in it being a black cat. However here in Polzeath, somebody takes collars off cats even paper collars, so like the red collar we bought Moonbeam, her sister it lasted only one day.