I agree with InkedMarie. Extra moisture is a big help in preventing crystals/stones. Another factor to consider is the amount of carbohydrates in the dog food. Foods with a lot of plant-derived ingredients (high in carbs) tend to support the formation of urine with a higher pH. Struvite crystals are most likely to form in urine with a pH above 7.0. Yet another reason to move toward a diet closer to the so-called ancestral diet of dogs which had very little carbohydrate.
Another thing to consider is traditional Chinese veterinary medicine. It can clear up bladder inflammation in ways that antibiotics sometimes cannot. I have an article about bladder inflammation on my blog if you’re interested: http://naturalalternativesvet.com/bladder-inflammation-cats-dogs/
Tabitha
