Right now I'd say rest is the best thing, give him a couple days of R&Rand keep a watch on the ankle, try to soak it in some warm Epsom salt water in something smaller than the big pool, when I had to soak my big drakes foot I used a plastic dish pan and just held him in place he did great, that way they can't drink the water either. He filled up the whole pan. lol If it's broken he may not be able to do alot of running around for a while try to keep him in a smaller enclousure when he would not be putting so much of an effort into walking just laying around resting then doing therapy in a smaller pool after a couple days of rest. Maybe some kind of Poultry vitamins for extra immune support right now would also help. Jumping in and out of the pool isn't to good of an idea right now .