Sergeant's Guardian Flea & Tick Collar for Dogs

first of all, let me say, i would NEVER place a flea collar on my dog. i've used them in the past, and every time, no matter what brand, within hours, my dog's nose is hot......not willing to do that to my pup. spot treatments (like frontline) are much better, warm nose only for a day, and they work pretty well. the reason i use these is, i cut them into pieces and throw a piece into my vacuum every time after emptying. any fleas i vacuum up don't stand a chance. been doing this for 40 years. i buy the biggest sized one, cut into approx 2" pieces. you're welcome