Trifexis is awesome and what I use for my active dog (and we have never had flea problems). The problem is that the pill smells very, very strongly of mold. I have to smash up the pill and mix it into peanut butter for my dog to even look at it. I also administer it outside and use gloves, because it will have your house smelling of mold for days. With a smaller dog (thus smaller dose/pill), you could force it down, but a 30+ lb dog will have too big of a pill and won't eat it normally for any reason.