Nice video undoubtedly, where at a certain stage you can see a zoo group sex in progress that is quite interesting in terms o thorough bonding. Well concerning to whom really controls, one may say that until the interaction takes place, the control of the situation is human (lady), but the moment she squats and puts herself on all fours, widening her thighs, opening her craving and desirable pussy ... and the dog jumps positioning himself on top of her, putting his front paws in a strong and powerful bond around her waist, then, there, the control becomes his; absolute control, even more when she normally bends submissively lower, in order to facilitate, the access and penetration of her pussy in deep thrusts and consequent burying of the throbbing knot, so as to assure full pleasure to both love mates, (woman and dog), being that she corresponds willingly and intensely, backing hard with her pussy against his vigorous cock thrusts into her pussy (when it is the pussy). So, two phases of effective control, in my opinion.