Dogs are social animals and can interact well with other dogs and humans. However, some dogs may display aggressive behavior during social interactions, which can be dangerous and should be addressed. Here are some signs of aggressive behavior in dogs during social interactions:

1. Growling: Growling is a warning sign that a dog is feeling threatened or uncomfortable. If a dog is growling during a social interaction, it is a sign that they may become aggressive if the situation continues.
2. Snapping: Snapping is a sign that a dog is about to bite. If a dog is snapping during a social interaction, it is important to remove them from the situation before someone gets hurt.
3. Lunging: Lunging is a sign that a dog is preparing to attack. If a dog is lunging during a social interaction, it is important to remove them from the situation immediately.
4. Stiff body language: A dog that is feeling threatened or aggressive may display stiff body language, such as standing tall, raising their hackles, or tensing their muscles.
5. Baring teeth: Baring teeth is a sign that a dog is feeling threatened and may become aggressive. If a dog is baring their teeth during a social interaction, it is important to remove them from the situation immediately.
6. Excessive barking: Excessive barking can be a sign of anxiety or aggression. If a dog is barking excessively during a social interaction, it is important to remove them from the situation before the situation escalates.
7. Aggressive posturing: Aggressive posturing, such as standing over another dog or putting their head down and tail up, can be a sign that a dog is feeling aggressive and may attack.

If a dog is displaying any of these signs of aggressive behavior during a social interaction, it is important to remove them from the situation immediately to prevent injury to themselves or others. It is also important to consult with a veterinarian or certified dog trainer to address the underlying causes of the aggressive behavior and develop a management plan to prevent future incidents.