[anonymous]

I wouldn’t mess around with his diet, If the stones return it may be difficult for him to tolerate another surgery.as a senior (age11)
Add water, presoak the kibble with water, add plain homemade chicken broth (no onions or additives)
Put a call into your vet to call you back when he has a minute. Ask him what you can add as a topper.
I think your vet will confirm, water added to meals and frequent bathroom breaks, opportunities to urinate are important..