I ordered Bravecto for fleas and ticks. The first time I got this med was from the vet and it worked very well. My dog had a flea allergy and she grew all her hair back very quickly after taking this medication. I ordered it again but this time from Allivet and I question the companies authanticity. My dog is losing hair again after taking the same medication but this time from allivet. It seemed to do nothing for her.