My 4 year old female samoyed had struvite crystals in her urine. She also had a UTI and my guess it was all due to stress (from a boarding kennel) and a poor Nutro diet. This was 2 1/2 years ago. I've replaced her poor nutrition with currently a rotation of Go! Chicken Fruit & Veggie (it has cranberries in it) and Wellness Core (it also has fruits in it) and canned California Natural. Every so often I also give her Solid Gold Berry Blend. So far so good.
What symptoms did your pup have? Geisha had urinary frequency, and blood in her urine. Interesting, the vet told me that if the clinic doesNOT get to the sample for several hours crystals do start to form in the sample. HMMM