Do dogs know if they are bother or sister?

Dogs don't understand the concept of "brother" or "sister" in the same way humans do. They don't have the same cognitive capacity for complex familial relationships.

Here's what they do understand:

* Social hierarchy: Dogs establish a pecking order within their pack, which includes both humans and other dogs. This is based on dominance, not familial ties.

* Individual relationships: They learn to recognize and interact with specific individuals based on their personality, behavior, and past experiences.

* Scent: Dogs rely heavily on scent for communication. They can identify individuals by their unique scent.

While dogs may develop strong bonds with other dogs they grow up with, it's not based on understanding their familial relationship. Instead, it's based on shared experiences, social interactions, and scent recognition.

So, while dogs may behave affectionately towards each other, it's not because they recognize a sibling relationship.