OK, I just tried to figure this out from their website, but didn't see any info. What kind of warranty? I have a WH ultrasoft that has a crack in the rubber. Soon it's going to be a very expensive french link!
When I bought mine, it came with either a 2- or 3- year warranty from HS. When I went to inquire, Dover just told me to send it to them and they'd handle it. I am more careful about not letting the horse chew on it at all now.
If you are allergic to a thing, it is best not to put that thing in your mouth, particularly if the thing is cats. - Lemony Snicket