Clyde, the pony, died of severe colic last year. On the advice of veterinarians at the University of California School of Veterinary Medicine, Davis, Mr. and Mrs. Dale Brooks, Clayton, California, had their long-time friend put down. Clyde taught the Brooks' six-year-old daughter Sarah, to ride, and was an important part of the horse-loving Brooks family. Mrs. Brooks vowed that the death of the 17- year-old Russian pony wouldn't be in vain