To say I'm ticked is an overstatement. I won an eBay auction for Frontline Plus for cats (it's been a long battle with fleas this year - never had them before, and have worked REALLY hard to get rid of them without using something this strong, but I'm at my wits' end). It was for an 8 week supply. I received 2 XL doses of Frontline Plus for DOGS, a small syringe, and a glass vial to put the extra formula in since the dose for dogs is so much larger than the dose for cats. I've contacted the manufacturer but have not heard back yet. Does anyone know - for certain - if they are the same formula? There were instuctions with it indicated to use 0.5ml for the dose. I really would like to hear from a vet or a vet tech...I sure as heck don't want to make my critters sick! THANKS!!!