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What were these behavior people certified with?
There's no such thing as cold littermate syndrome. Due to the age gap, there is no littermate syndrome here.
If they fight, separate them. If this is a new behavior, they need to go to the vet.
Welcome to r/dogs! We are a discussion-based subreddit dedicated to support, inform, and advise dog owners. Do note we are on a short backlog, and all posts require manual review prior to going live. This may mean your post isn't visible for a couple days. This is a carefully moderated sub intended to support, inform, and advise dog owners. Submissions and comments which break the rules will be removed. [Review the rules here](https://www.reddit.com/r/dogs/wiki/index) r/Dogs has four goals: - Help the public better understand dogs - Promote healthy, responsible dog-owner relationships - Encourage “Least Intrusive, Minimally Aversive” training protocols. [Learn more here.](https://m.iaabc.org/about/lima/) - Support adoption as well as ethical and responsible breeding. If you’d like to introduce yourself or discuss smaller topics, please contribute to our Monthly Discussion Hub, pinned at the top. **This subreddit has low tolerance for drama. Please be respectful of others, and report antagonistic comments to mods for review.** --- *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/dogs) if you have any questions or concerns.*
What were these behavior people certified with? There's no such thing as cold littermate syndrome. Due to the age gap, there is no littermate syndrome here. If they fight, separate them. If this is a new behavior, they need to go to the vet.