Bests & Worsts Reviews from Amazon

im giving this a zero, these are the meds for the worst case of fleas our vet has ever seen, after applying this flea killer weeks ago, and this is the bill for $ 92 to treat him for the damage to his skin and loss of hair in several locations we also used this brand on another dog we own and it did not work for him either we than ordered advantage 2 from amazon but he deveoped skin issue before we could use it we have never in the 14 yrs of our dogs life dealt with an issue like this ive ordered frontline in the past and it has worked well