I have two Golden Retrievers. These videos were made after just a few weeks of use. Something about the design allows hair to wrap tightly around the ends of the curlers. They were actually clamped (pet hair wrapped around the metal sleeve and pushed it out) and it took some effort with a screwdriver to get them out. The hair is tied so tightly that it takes a knife and about 30 minutes to free the sleeve. Do not order if you have a lot of pet hair