 Unlike a dog's penis, a cat's penis points backward.Although cats may mark with both sprayed and non-sprayed urine, the spray is usually more thick and oily than normally deposited urine, and may contain additional secretions from anal sacs that help the sprayer to make a stronger communication.While cats mark their territory both by rubbing of the scent glands and by urine and fecal deposits, spraying seems to be the "loudest" feline olfactory statement.