I have never tried Evo, therefore I am not familiar with it.
I have had good luck with Zignature whitefish and Nutrisca salmon.
Both are grain free and potato free.
Pro Plan Focus for sensitive stomach and skin is potato free, not grain free.
Three or four small meals per day instead of two.
The most important thing, as you have learned is, add water, presoak kibble too, if need be. Also, make sure to offer frequent bathroom breaks, opportunities to urinate.
Stagnant conditions in the bladder contribute to stone formation.
Some dogs just don’t drink enough, if at all. Combine that with a genetic predisposition and you have trouble.
copied from one of my previous posts regarding a similar topic:
“Regarding cranberry: http://skeptvet.com/Blog/?s=cranberry
Also there are prescription meds for stubborn cases, talk to your vet”.
“Was an ultrasound done? Dogs can have more than one type of stone, such as calcium oxalate and struvite…that was the case with my dog that had reoccurring UTIs”.
This is not veterinary advice; consult your veterinarian.
PS: Note recent question on struvite in comments: http://skeptvet.com/Blog/2016/09/science-based-veterinary-nutrition-success-stories/comment-page-1/#comment-121266
