I bought a crib for my older dog. She urinates sometimes and we have a cat that loves to urinate on her bed. I had them for about 10 months and they worked great. Very waterproof but liquid does not run down the sides of the mattress. I've washed them a few times and they've held up well - although I don't dry them, I just hang them to air dry. I think drying will damage the waterproof barrier. I guess 2 packs because I can change them if one is dirty and the other is clean. They are also very soft and smooth and the gray color is pleasant. I will buy more if they ever wear out.
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