A British experiment found that after separating female dog from their young children, they were mixed with a group of adult dogs and puppies of the same kind, and then put the female dogs into the pack  The female dog will soon join her children  Studies have shown that dogs' body odor is the basis on which they identify each other  Puppies can't tell the smell of their mother from that of other female dogs
Of the two alternative interpretations of a phenomenon, determine the other by excluding one
 So every female dog can tell the smell of her children