About a year ago I started using Hartz Flea & Tick Shampoo on my dog, the green stuff, that looks like slime. As we washed her, we noticed a large amount of her hair falling out, so much that it actually clogged the drain, and she is a short haired dog, so you can imagine how much of her hair it would take to clog a drain! We had no idea it was the shampoo. We were new dog owners, so I thought that maybe dogs just shed a lot when they get baths. I had no idea. It was about 6 months later that we changed her shampoo to a natural oatmeal shampoo. After we washed her, there was almost NO hair in the tub! We were completely shocked to find out that the Hartz Flea & Tick Shampoo had caused her furr to fall out. I have never used a Hartz product since then. I wish I would have found this site sooner, and I would have never purchased the stuff.