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This is Dr. KV. I'm here to help with Bennie.
Prozac does not conflict with the SO diet. It does not cause bladder stones. Some dogs are prone to forming stones even when they are on the special diets, so it would be a good idea to periodically check his urine for crystals, the building blocks of stones. I usually recommend doing this every 6 months to ensure we catch crystals before a stone forms.
Yes, when crystals are detected, the best thing is switching to a dissolution diet, such as the SO diet Bennie is currently on. That is a very good diet.
Bladder stones are formed for a number of different reasons, so it can be challenging to treat. Not all stones are formed by the same crystals, so often they need to be surgically removed. If we are lucky, they can dissolve with diet changes, but that is not always the safest approach.
I'm sorry Bennie needs a second surgery! It sounds like he may be one of those dogs that tends to form stones despite treatments and prevention. Tap water is generally ok, I have not recommended a change in water source with my patients.
Eating a bit of different things here and there should not affect his urinary pH to contribute to stone formation. Stone formation takes time, so it can be a long process over months. I would consider trying a different prescription diet if your vet finds that this new stone is composed of struvites. If it is a mixed composite stone, those are much more tricky, and presription diet may not be helpful. The hard question to answer is how many stones would Bennie have had without the SO diet...so it may be helping to some degree. Although, I understand how frustating this must be for you. :(
You're welcome. Good luck with Bennie. Please feel free to reach out if I can assist you further.