Whirl Wheel, but she absent-mindedly took one with her when she went for the other.
So, a problem. How to bring them both back to shore? She's a determined dog, and swam in circles, trying to figure out how to do it, gradually drifting further and further downstream.
Here's a clip of how she solved it. You can hear us calling her to head back to shore with the first one. After all, we didn't really care if the second toy floated down the river and out into Port Phillip Bay, as long as Penny got back safely to shore. But as you can see, she wasn't going to give up. (By the way, the birds chirping in the background are bellbirds.)
After all that effort, it was time to shake the water off...
and roll on the toys.