Struvite crystals in dogs are almost always caused by infection (even without symptoms). If no bacteria was seen on the urinalysis was a urine culture recommended? If antibiotics were started because of infection did the get say the food switch did not need to be long term?
Only antibiotics can treat the infections that cause struvites.
The urine should be dilute to help dissolve them. I think the standard of care is opposite of a mostly meat diet.
The pH needs to be lowered.
HK is sort of highish fiber, but nothing crazy. That should not be a huge problem and would not cause an infection in and of itself.
Find and treat the infection.
Get rid of the crystals even if that means a vet diet.
Go back to food you prefer when vet says it's ok.
Or talk to a vet nutritionist about formulating a diet...
jMO
