Seresto Flea and Tick Collar for Dogs

First time in many years since I have needed to use a flea removal product. They arrive in individual cardboard tubs, I am not sure they are entirely necessary as once on the dog it is unlikely that you will take them off and need to store them. They are easy to fit and just the surplus needs to be cut off with scissors. I honestly don’t know how effective they are but my farrier swore by them for his dog. Both dogs still scratch a bit, but have not seen any evidence of visitors. The Doberman definitely did before I bathed her. The standard poodle was very scratchy before, no sign of anything though , but still scratching a bit. I have sprayed the house and car as well. I am using these as a’back up’ to re- enforce what I have already done. I would rather this than feed a tablet that cannot be reversed if they have an adverse reaction to it.