There is NO magic supplement. The trick is to add water to each meal 3-4 small meals per day soaked in water, don’t measure, just fill the small bowl, the dog will lap it up to get to the food.
The dog must be taken out to void (pee) ideally every 2 hours during the day. At bedtime and first thing in the morning. Stagnant conditions in the bladder are conducive to stone formation.
There is nothing wrong with Royal Canin Urinary SO. If you get the dry, soak it in water overnight then add water too. Once the dog is stable, few months to a year, you can talk to your vet about adding something tasty to the prescription food, like cooked chopped up chicken breast or some other lean meat.
Did you check the search engine here /forums/search/bladder+stones/
Read my posts, you may find some helpful tips
Some info at this site you may find helpful http://skeptvet.com/Blog/?s=bladder+stones
