Swimming is the best therapy for dogs with arthritis. It has the least amount of stress on joints of any physical activity a human or a dog can participate in. If it's good for dogs with disabilities then it has to be good for Kiara! If she loves it and her skin is not getting dried out from the chlorine, then let her swim as much as she wants! You may want to supplement her food with some kind of omega 3 fatty acid or fish oil supplement to keep her skin from drying out as the summer goes on.