Whether a dog's ascites can heal on its own depends on the cause. If it is caused by a ruptured bladder or kidney disease, it will not heal on its own and the condition will become more and more serious. You must take it to the hospital for medical treatment, otherwise the dog's life will be in danger. .. If the ascites caused by liver disease will not heal on its own, but it may not become serious, you must take your dog to the hospital. If it is due to nutritional reasons and the ascites is not serious, the dog’s ascites will heal on its own if the diet is properly adjusted.