I have been thinking about supplementing milk thistle into Jack's diet for a while so I was stoked when I discovered I had the chance to try it out! The main thing I was concerned about was that Jack was not going to like it. He is extremely picky and it is challenging to find supplements he will eat. The first day I took his food, added a little warm water with the milk thistle and his other supplements. He gobbled it up! He has eaten it everyday since then and I have not had any problems. Jack just turned 7 years old, so he is not a puppy anymore. I want to keep him as healthy as possible as he gets older. I have also noticed that since I added the milk thistle to his diet his tear stains seemed to have cleared up a bit. I know that silymarin (an active ingredient in milk thistle) is an antioxidant, so I believe this has contributed to that. Thanks Herbsmith!