I just used Hartz Ultra Guard Flea and Tick Drops on my dog 3 days ago and I haven’t noticed any problems with him, but I am afraid that he may develop something from the use of this product. I just happened upon this site because I typed in flea drops looking for information about Advantage Flea Drops. I had NO idea that Hartz was such an awful product until I read some of the stories. Now I’m afraid that something could happen to him because I put the drops on him. It has been three days and there have been no reactions, but I’m not sure how long it takes for reactions to show up? If anyone has any ideas how long it would take for a reaction to occur, please let me know. Thank you.
This will be the last time I ever use a product made by Hartz!