Pet owners may purchase a certificate from Friends of Animals that can be used for a routine spay or neuter surgery at any of FoA’s participating veterinary hospitals. Spaying and Neutering Certificates may be purchased on-line. Or to order by mail call 1-800-321-PETS (1-800-321-7387) and request an application The recommended age for spay/neutering is 2-6 months of age. Female animals should be spayed before their first heat (estrus cycle). They do not need to have a litter before spaying.