I love Ultra Shield EX it is the only product that is effective on my dog which is always with me and my 2 milk cows that cant stand still if there is even one fly on them. The horses love this spray and it keeps them free of ticks and flies in the field and on the trail.
I just recently moved from Oklahoma to Pennsylvania, this product worked FANTASTICALLY in Oklahoma, I brought 2 gallons with me to keep the horses covered-big surprise-not effective at all on flies here! As if I didn't even apply it. I know the formulation isn't different, I brought the bottles here. Very disappointing, the flies here are BAD and other than shade/masks/mechanical prevention we've still not found an effective spray.