If you are resident of the City of Fontana and need to give up your animal either for adoption or to be humanely put to sleep, you may bring the animal into the Riverside County Animal Shelter. Requests for euthanasia will be done on the same day the animal is turned in. Those animals suitable for adoption are made immediately available for adoption, signature requested, but a guarantee is not given in finding the pet a new home. The time period which an animal is maintained at the shelter is undeterminable. Many factors are taken into consideration before the animal is chosen to be humanely euthanized.