Struvite Urolithiasis in Dogs: Welfare Management

Struvite bladder stones are the most common urinary stones in dogs, causing painful lower urinary tract disease that is highly amenable to dietary management.

Key Facts

Struvite uroliths in dogs are typically caused by bacterial urinary tract infections that create alkaline, ammonia-rich urine promoting magnesium ammonium phosphate crystal formation
Female dogs and miniature Schnauzers are predisposed due to UTI susceptibility and genetic factors respectively
Dissolution diets work by restricting protein (reducing urinary ammonia) and promoting acidic urine — dissolution takes 4-12 weeks
Unlike in cats, most canine struvite stones are infection-induced and dissolve with dietary management combined with antibiotic treatment

Welfare Considerations

Struvite urolithiasis causes lower urinary tract welfare impairment including frequent painful urination, haematuria, difficulty voiding and — in severe cases — urethral obstruction that is a life-threatening welfare emergency. The welfare response to struvite stones requires simultaneous attention to pain management, antibiotic treatment of the underlying UTI and dietary dissolution. Dogs with urethral obstruction require emergency catheterisation before any other treatment can be effective. Recurrence prevention through long-term dietary modification and UTI surveillance significantly reduces chronic welfare burden.

What You Can Do

Treat the underlying UTI with culture-guided antibiotics alongside dietary dissolution therapy
Feed prescription dissolution diets exclusively during treatment — mixed feeding reduces dissolution efficacy
Manage pain and lower urinary tract inflammation with NSAIDs during the dissolution period
Implement urine culture surveillance every 6 months in dogs with recurrent struvite stones to detect relapsing UTI early