Trick and Treat will be 5 years old soon, so I've dusted off the Dr. Spock book to find out what we can expect from them now. True, the twins are not your run-of-the-mill Milwaukee youngsters. They're orangutans, but in many ways, they seem so much like the kids next door that baby doctors' advice must apply to them, too. One of Dr. Spock's comments jumped right out at me like a black cat on Halloween. He said kids about 5 or so often become afraid of animals, even though they have had no bad experiences with them.