Cystinuria Type II-B

Kidney and Bladder

A disease of cystine accumulation, affected dogs are prone to developing cystine kidney and bladder stones. Fortunately, dogs with cystinuria maintain perfectly normal blood concentrations of cystine (unlike humans), and do not experience any ill effects from their disease besides stones.

  • Signs and symptoms

    Affected dogs will show no clinical signs of disease in the early stages. As stones form, dogs will often urinate more frequently, urinate in inappropriate places, and possibly have blood in their urine. If a urinary obstruction forms, they are unable to urinate despite frequent straining. This is a medical emergency.

    Signs typically develop in adult dogs when stones have had the chance to develop.

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  • Diagnosis

    Genetic and laboratory testing are used to diagnose this condition.

  • Treatment

    If caught early, Cystinuria can be managed with dietary changes, increased water intake, and certain medications. If stones develop, surgical removal is often necessary.

  • What to do if your dog is at risk


    • Regular veterinary visits and laboratory testing will be vital to catching this disease in any early stage where it can be more easily managed.
    • Closely monitor your dog for changes in their drinking and urination patterns.

  • Genetic Information

    This mutation was first described in the Miniature Pinscher.

    This mutation is inherited in an autosomal dominant manner, meaning that one or two copies of this gene will cause the disorder.

    Gene names:

    SLC7A9 (Exon 9) ‐ chr

    Inheritance type:


  • Breeds affected

    This health condition affects the following breeds

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