I think that before his cock gets buried into my pussy he knows there is a difference, but once he starts pumping his meat into me, all he knows is, it's warm, wet and feels so fucking good. He just want to pound his cock as deep as he can into me so that he can shoot enough spurts of hot tingling dog cum into my pussy is so full that his sperm completely invades your womb. To that end, he tries to knot you to make sure the job is done. He is lost in the lust of the moment and could care less if I am a dog or a woman. He just knows that, right now, fucking me is the best thing he's ever felt and that his cock feels so fucking good.