Strong Maternal Instincts

You really do not need to get into deep scientific stuff, suffice is to know that Oxytocin is a hormone that is known to cause love and jealousy and when a She dog is about to become a mama, her body releases this hormone making her extra protective and overly caring of her litter. The maternal instincts need a vent out, but what happens when a dog whose motherly instincts are strong doesn’t get to be a mother?