I think I am going to need help with this one! It has been over 20 years since I've had a "puppy"! This one is Jeckyl and Hyde! One moment he is the sweetest, most loving thing on earth! Next - he is the devil himself! But since it has been a while since my last puppy - I thought that a good book on chihuahuas would be helpful. There is sooo much out there - anyone have any suggestions!