I have always been somewhat skeptic about products for our dog, but I will say that DPA really works. I don’t know what else to say? I have an older 11-year-old German Shepherd, she’s 120 pounds and has been laying on the couch and not very interested in life. Now she is now up and around and barking at the birds. Thank you very much it’s so good to see my daughter well. I give it to her twice a day and she’s doing really well.