My neighbors' Golden has one she LOVES IT!
Did you know you can easily make your own for a fraction of the cost?
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I have the instructions here somewhere. I think they are on my old computer. I'll look tomorrow.
You make them out of those lil' crystals that are used in gardening. They are sold in home and garden stores to help keep the dirt in your flower pots moist. ~like the stuff in disposable diapers.
If you do decide to order one from a store, I reccomend "PetEdge" I think they have the best prices... Their largest mat is only 63.99 and small one 29.99. http://www.petedge.com/shopping/product/detailmain.jsp?itemID=887&itemType=PRODUCT&iMainCat=0&iSubCat=0&iSubSubCat=0&iProductID=887&AS=1