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Research suggests that dogs are able to recognize their siblings and their parents later in life as long as they spent the first 16 weeks together. Intuitively, the less time dogs spend with their families as puppies, the less likely it is they'll be able to recognize a family member later on.
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Dogs are pack animals.

Their parents and littermates are Their first pack.

If two littermate pups are adopted by neighbors and see one another regularly, the Dogs will recognize one another, they will adapt to the other dog (sibling) being a part of Their life without necessarily recognizing the familial connection.

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