Very Strong Ammonia Smell In Cat Urine. They absorb moisture, in order to prevent urine from pooling. Like bottled ammonia, cat urine ammonia emits a strong odor that triggers asthma and allergy symptoms in those sensitive to it.
The shoe can smell like cat urine. Some cats will have stronger smelling urine than others. Sometimes increasing his water intake may dilute out the urine making is smell less strong.