Prescription Royal Canin SO diet can help dissolve struvite uroliths specifically, and prevent formation of struvite and oxolate uroliths. RC also makes multiple diets with the SO index, including a behavior modifying diet, Calm. Stress is primary contributor to urinary disease, including bacterial infections, sterile inflammation, uroliths in the bladder (cystolith) or kidneys (nephrolith), as unsure which your vet has diagnosed. Moderating stress with diet, supplements, environment, and exercise, can help reduce stress induced disease and inflammation. Feliway (cat) and Dog Appeasing pheremone products are very helpful. Over the counter products by veterinary companies, such as Composure (Vetriscience), Zylkene (Vetoquinol), and Calming Care (Purina) are the most utilized amongst vet professionals. Long-term use of the rx urinary diet is recommended in repeat urethral obstruction or urolith affected pets. Obstruction by crystals blood/bladder cells, and stones is emergent, as blood cannot flow through the kidneys to filter toxins into urine, and toxins accumulate in the blood, leading to electrolyte imbalance, azotemia, dehydration, hypotension, and shock left untreated. Since he is older onset, ensuring water intake and more elimination opportunities on walks/yard visits will help decrease risk for concentrated urine accumulating crystals, which can form uroliths that gain size the longer crystals are present. Dilution decreases urine crystal formation. Inquire as to the serum kidney values, to ensure underlying kidney changes are not the contributors to the bacteria and crystals sited in his urine. Ultrasound is the best way to diagnose urinary tract changes, inflammation, and foreign material; limited abdominal U/S can find early kidney changes, prior to any abnormality in serum/blood work. Hope your boy continues to improve, as he already sounds 100% turnaround. Link to SO index Calm diet https://www.royalcanin.com/us/dogs/products/vet-products/canine-calm-dry-dog-food
