Hello awesome MOZ Community! Our development team uses a sub-domain "dev.example.com" for our SEO clients' websites. This allows changes to be made to the dev site (U/X changes, forms testing, etc.) for client approval and testing. An embarrassing discovery was made. Naturally, when you run a "site:example.com" the "dev.example.com" is being indexed. We don't want our clients websites to get penalized or lose killer SERPs because of duplicate content. The solution that is being implemented is to edit the robots.txt file and block the dev site from being indexed by search engines. My questions is, does anyone in the MOZ Community disagree with this solution? Can you recommend another solution? Would you advise against using the sub-domain "dev." for live and ongoing development websites? Thanks!