I have heard so many great comments about this and decided to try it out for my aging Great Japanese Dog who I love to bits.He was having difficulty getting up and down and his agility has been affected. Since I put the collar on him he has been louping around back to his normal self and I am impressed. He is 14 years old and was born here. He is my Teddy but very large.I am sooooo pleased and he now has quality of life. I'm happy for him too.