<filename>lostanimals/lostpet/admin.py
from django.contrib import admin
from django_google_maps import widgets as map_widgets
from django_google_maps import fields as map_fields
from lostpet.models import Pet

# Register your models here.


class PetAdmin(admin.ModelAdmin):
  formfield_overrides = {
      map_fields.AddressField: {'widget': map_widgets.GoogleMapsAddressWidget},
  }

admin.site.register(Pet, PetAdmin)

<filename>lostanimals/lostpet/admin.py
from django.contrib import admin
from django_google_maps import widgets as map_widgets
from django_google_maps import fields as map_fields
from lostpet.models import Pet

# Register your models here.


class PetAdmin(admin.ModelAdmin):
  formfield_overrides = {
      map_fields.AddressField: {'widget': map_widgets.GoogleMapsAddressWidget},
  }

admin.site.register(Pet, PetAdmin)

# Register your models here.