My dog is utterly confused by swimming pools and refuses to go in. To them, it's a giant water bowl, and they really don't know what to do with it. But whatever you do, don't force them into the pool or carry them in, because this makes them panic. Also he/she may not know how to get out, so try showing him where the steps to the pool are and going down it individually to show him how. He might understand, but just be patient. thanks a bunch!