We had to replace our shower curtain, also. We went to Walmart and purchased 2 standard shower curtains, cut the length down and hemmed them. We turned the hem towards the outside of the shower to shed the water. We then overlapped the curtains about 10 inches to keep the water in the shower. It takes a little getting used to, but it works.
But think, if the dog tries it again, it is a cheap replacement.
2006 22ft towlite (replaces 97 21TL)
2006 Toyota tacoma pre-runner 4.0 L V-6 quad cab
w/ 98 chevy Powervision towing mirrors