Each year, anywhere from 5 million to 15 million unwanted cats and dogs are euthanized at animal shelters throughout the United States. In an effort to understand the causes of pet overpopulation and such widespread loss of animal life, UC Davis will host a symposium Friday and Saturday, Dec. 3 and 4, in MU II of the Memorial Union. Conference participants will discuss the issues as they relate to California. "We hope the collaborative efforts of animal health care professionals, shelter directors and pet industry representatives will produce a broad information base, as well as creative solutions for this tragic problem," says Lynette Hart, an animal behaviorist and director of the UC Davis Center for Animals in Society. A news conference addressing pet overpopulation issues will be held at noon Friday, Dec. 3, in MU II. Symposium findings will be reported Saturday, Dec. 4, at 11:45 a.m. The symposium is sponsored by UC Davis, the California Veterinary Medical Association and the California Council of Companion Animal Advocates.