I joined care2.com to make people aware of the danger of the drug Trifexis used to treat fleas. this posion has caused horrible side effects to dogs or death. my little doxie Freakle's was a healthy 3 year old. until I used trifexis. it caused liver failure and her organs were destroyed. she was put to sleep Jan 21 , 2013. I just wish I had done some research on the trifexis before it was given to her, but I trusted my vet and gave it to her. it breaks my heart to know what pain and suffering she must have gone through.