A red flag dog behavior is any sign that may indicate a serious behavioral issue or potential danger, such as sudden aggression, extreme fear, or destructive actions.
When dogs don't like you, they may avoid eye contact, keep their distance, growl, or exhibit signs of discomfort such as stiff body language or raised hackles.
The 3-3-3 rule helps new dog owners understand a rescue dog's adjustment period: 3 days to decompress, 3 weeks to learn routines, and 3 months to feel at home.