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.
1 A frock is a dense knitted overgarment worn by sailors and fishermen, as guernsey frock, jersey frock (now usually simply guernsey and jersey). 2  The name oil frock has been used for a type of sailor's oilskin.