Check out Nutrisca Salmon and Chickpea (dry and canned). Wysong Senior is good, IMO.
The best thing you can do to prevent bladder stones (all types) is to add water to meals and soak the kibble overnight in water, frequent bathroom breaks, keep the bladder flushed. Three or four small meals a day, do not free feed.
There is often a genetic component, some dogs/certain breeds are more vulnerable.
If you use the search engine here, you may find some helpful tips, just type in allergies, bladder stones.
Consider consulting a Veterinary Internal Medicine Specialist if the regular vet isn’t helpful.
PS: Check out Chewy . com
