While it's unlikely we'll stumble into a long lost sibling in the street, there's a huge possibility that dogs will come face-to-face with their littermates in the park.
One third of dog owners in the UK got their puppy from a breeder last year, meaning hundreds of siblings could potentially be living nearby.
We know how clever canines are, but can they really recognise a relative later in life? Does their shared DNA mean they've got an everlasting memory?
