I read this post as a result of searching for information and reviews on flea pills. My 3 year old cat died 3 weeks of ‘probable cause – heart failure’ after giving her a Comfortis pill in early 2017 and I am scared to use that again. My dog however is so flea infested that sprays and baths arent enough. I’m still deciding which one to try, but wanted to answer the initial question, yes, I believe we should be extra careful about this type of treatment. It was a traumatic experience to see my kitty go like that, and so young also. She was a healthy indoor kitty and I regret not doing the research before giving Comfortis to her.
