Suddenly, you feel a sudden, sharp pain clutch both your legs. You fall forward onto your hands and knees, wincing at the pain caused by your apparently cramping muscles and from the fall. You twist your body to look back at your legs and gasp out loud at what you see. The tips of your toes have begun to swell into a pair of rounded paws while your big toes shrink into your feet. The both of which are lengthening even as your shins shrink. Your calves thicken noticeably as a bump begins to protrude a bit at the back of your hips. But what you have seen so far is nothing compared to the thick layer of fur that is growing across your body.
You then look at the rest of your body. Your arms, legs and chest have toned up considerably and become more masculine. And despite what is happening to you at the moment, you find yourself very pleased. You smile and then you feel a very odd sensation coming from your hips. You look back and gasp at the sight of a tail sliding its way out. It wags back and forth with each renewed feeling of pleasure you are feeling. You smile again and without really thinking about it, you begin to pant as the changes continue to pace themselves.
Several minutes later, you pull yourself up a bit onto your crouched legs and pant a bit more before looking down at yourself again. Looking past your new muzzle, you look down upon a body that is an equal mix of human and canine. You have become an anthro Golden Retriever.