What is the fastest way to make a dog urinate?

The fastest way to induce urination is to use a diuretic, such as hydrochlorothiazide or furosemide, to promote urine formation. After taking the medicine the dog will quickly feel the urge to urinate.

However, diuretics must be used under a vet’s advice based on the dog’s specific condition, to avoid excessive urination, electrolyte imbalance, or dehydration. If the diuretic works poorly, take the dog to a clinic for catheterization, or first try pressing the bladder at home to stimulate urination.