Well, the neighbor's cat must have been walking across the cover on our AGP and fallen in. At least the cover is off the edge and in the pool and we noticed the water level was down. A day later we noticed it was very wet on the outside of the pool several feet away. We think we found all of the claw marks, but it was too cold to do a 100% thorough check as the water was coooooooold! I guess we patched 2 or 3 claw slits. They are on the north side of the pool, which catches all the sun. This will be our 4th season with the pool and we were wondering what our chances are of being able to find all the claw marks and keep the liner for a long, natural life. What is the natural life span of an AGP liner? Does everyone do the patch job dance at some point?