During the estrus or heat stage of her estrus cycle, her urine contains pheromones and hormones, both of which signal her reproductive state to other dogs. This is the reason that dogs in heat will attract other dogs, particularly males.
smock. 1  a loose, lightweight overgarment worn to protect the clothing while working. 2  to clothe in a smock. 3  to draw (a fabric) by needlework into a honeycomb pattern with diamond-shaped recesses.
Definition of smear. 1  1a : a viscous or sticky substanceb : a spot made by or as if by an unctuous or adhesive substance. 2  2 : material smeared on a surface (as of a microscopic slide); also : a preparation made by smearing material on a surface a vaginal smear.