Whoops! MAke Our Khaki Campbell's pool is the middle sized one that WalMart sells and is about 10" deep. We've found three dead in the pool in the morning with no obvious signs of trauma. Watching them I noticed that some had trouble getting out of the pool because of the slippery edge. I put two concrete paving stones, 4" thick in where they mostly tried to get out two months ago and had no problems since. My theory is that they would wear themselves out trying to get out and drown.