We have three small dogs and one large dog, and this makes the third time Ive ordered a Seresto collar for them to protect them from fleas and ticks.  These collars really work!  In the 2 1/2 years weve been using these collars we have not seen the first flea or tick on ANY of our dogs.  We have a grandbaby that is now crawling around our house and its even more important now than its ever been, if I didn't know for certain that these collars were great I wouldnt take the chance.  They have no odor to them, they're not greasy, they don't irritate my pets skin or fur.  And I can put them on and forget about them for the full eight months.  And they do truly last the full eight months.. Ive replaced these exactly on the eight month anniversary each time and they're still working great every time.. Ill be back in eight more months to buy again!