Since we bought the girls their pool, we have gotten Penny in a few times to see if she would like it or not. Much like with the trampoline, she tends to run around the outside of the pool barking when we are in it and she is not. We bought her a pink polka dot life jacket and get her in when we all get in, but we could never tell if she really liked it or not.
Yesterday the girls and I were swimming and Penny was doing her usual run around the outside and bark routine. We didn't think anything of it until Carson saw her standing at the top of the ladder waiting for us to let her in! I strapped on her life jacket and off she went. She likes to swim around in a circle and come back to the ladder to rest. She will put her front paws on one step and even put her back paws on the step below to rest. It is quite entertaining.