this review title is: best solution has been to presoak collar and the content is: unfortunately not a silver bullet for preventing the collar ring found that to fully prevent a brown ring i would have to cover enough of the collar to clearly show the tape i stopped using it after a weekbest solution has been to presoak collar scrub with a brush soak in oxiclean white revive takes all the brown out.there are other information for this review, one is this reviewer did purchase it and the other is 0 people think this review is helpful.