They do not slip , at least on my floors. I can slide it around, so it does not grip like a rug with a base that clings to the floor; but we have one right by the bathtub and step on it getting into the bath every day, and it does not just slide around.
The bedroom one is on carpet, so no problems there. I am not sure how it would be on a slick hardwood floor, because I do not have that here. I think that having the yarn along with the plastic helps them not to slide.
I have made little rugs for dog beds, and they love sleeping on them, too. In fact, my Chipper, and now Marco Poodle, like to lie on my lap while I am crocheting anything large enough for them to snooze on while I am doing it.
It is something I enjoy doing in the cold and dreary winter months, when it is often too cold or wet to enjoy going outside. It is a great way to use up odds and ends of leftover yarn that you have no other projects for, and saves throwing away those grocery bags, too.
