I got a flea and tick collar for my little girl Lady because I travel a lot read all the directions thoroughly took the collar out of the bag activated it and put it on her. I noticed the smell was really strong. That evening she started coughing and having a hard time breathing. I immediately took it off of her. That was about 6 months ago. Now she has a tumor by her adrenal gland. I didn’t take her in because when I took it off the symptoms stopped.