Yep, stock tank FTW. They come in lots of different sizes, and you can make them as fancy or as rustic as you want. Three dogs and several of their friends haven't made ours look any different from the day we bought them. We even set up a fancy solar-powered waterfall situation between our two stock tanks. Our neighbor has one with a whole filtration/chlorination system set up in it, so it looks as pristine as a swimming pool, but we just allow ours to be more pond-like. We do have a filter to keep it from being totally gross, but we don't add chlorine, etc. like a pool.