The dog is not uncommonly a sufferer from stone in the bladder, the writer having seen the whole cavity practically obliterated by the presence of one or more calculi.

Considerable numbers have been removed by operation.

When there are a number of calculi in the bladder, the rubbing of one against another causes the faces of them to become very smooth.

Calculi vary in size, hardness, weight, shape, and position; likewise are more frequent in dogs than bitches.

The chief indications of stone in the bladder are the passage of small quantities of urine at very frequent intervals, often blood-stained.

For the relief of this condition, surgical aid is necessary.