do dogs remember their siblings

Dogs can remember their siblings to some extent, especially those they lived with for the first weeks or months of their life. Studies show that dogs may recognize their siblings by scent, which is their primary way of recognizing others, but this recognition tends to fade after about two years if they do not live together. Dogs consistently recognize their mothers longer than siblings, likely because of the mother's crucial role in early development. Reunions of littermates after long periods may show recognition behaviors, but these are usually limited to those siblings the dog actually cohabited with. The strength and duration of this memory also depend on the quality and frequency of their early interactions and environment during social development.