Izinja ezihlanjiweyo okanye ezingathathwanga zicetyiswa ukuba azisetyenziselwa ukuzala. Zintathu izibonelelo eziphambili zokungathathi cala:

1. Fokanye izinja ezibhinqileyo, ukungabinakho ukunqanda i-Estris, kuphephe ukukhulelwa okungafunekiyo, kunye nokuthintela izifo zokuzala ezinje ngezitulo zefune kunye ne-Pyogenesis. Kwizinja eziyindoda, i-Caperation inokuthintela i-Prostate, i-testis kunye nezinye izifo zenkqubo yokuzala.
2. I-Sterilization inokuthintela ngokufanelekileyo ukulwa, ubundlongondlongo kunye nolunye ugwenxa kunye nomngcipheko wokulahleka.
3. Ukungathathi cala kunokunciphisa inani lezilwanyana ezilahlekileyo. Ixesha elicetyiswayo lokuthathwa ngaphambi kokuba kufike i-Estris yokuqala yezinja ezincinci neziphakathi: iinyanga ezingama-5-6 ubudala, iinyanga ezili-12 zezinja ezinkulu. Umngcipheko onxulunyaniswa noSterization buyintloko, kodwa unokulawulwa kukondla kwesayensi yokutya okusezantsi.