In early April of 2009, I applied Sergeants Flea & Tick Powder to my 5 year old Tabby, Oliver. A couple days following, I noticed that he was having muscle spams. When I took him to the vet, I was asked if I had applied any topical powder to him and was then told that Permethrin-- one of the active ingredients in Sergeant Flea and Tick Powder for Cats—is harmful to animals and was causing the “tremors.” Oliver was diagnosed with Permethrin poisoning. At the end of May, I took Oliver in to discuss treatment as the... read full review »