Ok, just had to add some more. Had a friend over yesterday (our first thanksgiving turkey, then Thursday again!) and she saw Hershey 12.8 years old and she mentioned how alert he was. Coat and eyes were clear and shiney! I was really excited to hear this as I read this about others' dogs in different forums etc. So, anyone thinking about it, it is not a fad…..it works and they all love it!