during this hot summer season mosquitos seem to be every where. how can i keep them off my dog to prevent hazardous diseases... and other deadly diseases. Also recently my dog got a hot spot on his tail and i took him to his vet and he assumes its from a flee bite and gave me a spray i use on his hot spot to calm it down... but for future reference... between frontline and advantage which is the most effective flee med. for my dog? thank you