Step 1: From the dashboard click Settings > Reading
Step 2: Check the Search Engine Visibility (Discourage search engines from indexing this site)
Lastly: Click Save Changes
Make sure the dev site is not indexed by google
Archicoders Blog
Step 1: From the dashboard click Settings > Reading
Step 2: Check the Search Engine Visibility (Discourage search engines from indexing this site)
Lastly: Click Save Changes