The magnesium loss appears to be secondary to higher concentrations of glucose in the kidney that increase urine output [2]. (ods.od.nih.gov)
If you notice a change in your pet's fluid intake (and subsequent increased urine output or increased urinary accidents) call your veterinarian for an examination. (thesprucepets.com)
When you travel to high altitudes, your body acclimates by speeding up your breathing as well as increasing your urine output. (health.com)