Kozy, my 9 year old Shih Tzu/Yorkie cross, was diagnosed with struvite crystals two years ago. The first vet I saw advised me that she either had to have surgery immediately to remove the struvite, or be put down. Those options seemed extreme, so after getting a second opinion, the vet recommended changing her diet to Royal Canin Veterinary Diet Canine Urinary SO. To our amazement, after only one month, all the crystals and stones vanished. Since then, eating a diet of both dry and canned Urinary SO, Kozy has had a couple of minor infections, but zero signs of stones. Thanks to your products, and the veterinarian who recommended them, Kozy is still in good health, good spirits, and enjoying life.