I'm kind of an astrology freak and have many books on the subject, but yeh it's hard to do a birth chart if you dont know what time he was born. Anyway, if you combine the sun sign (gemini) with his chinese horoscope (dog) it says 'he often lacks inner balance, as he is always edgy and on the defnsive. He adopts extreme, conflicting attitudes, as if to emphasise the duality belonging to the sign of Gemini. The more he appears fatalistic and clear-headed, going out of his way to be derisive and cynical, the more he pretends to be a carefree, unrealistic, fanciful, exuberant person. Whichever is the real persona, he has difficulty in taking life or himself too seriously.'