the reviews on Vectra D don't seem to good, I also looked up Parastar, they were a little better but still not great, I bet it is the same with many of the other, ugggggh I hate making this decision, I agonize over it every year and I am on the way to the vet, think I will stick with Parastar but it bothers me that no one talks about it. I also give Lola the chewable heart guard which my vet does not seem to want to use anymore, but I don't want to switch since I have had good luck and this way I do heart worm on the first and flea and tick on the 15th
Amazon.com: Customer Reviews: Vectra 3D Flea Tick Mosquito Topical Treatment, Dogs 56-95 lbs (6 Doses)