ת"ר כלבים בוכים מלאך המות בא לעיר כלבים משחקים אליהו הנביא בא לעיר וה"מ דלית בהו נקבה:
The Sages taught: If the dogs in a certain place are crying for no reason, it is a sign that they feel the Angel of Death has come to the city. If the dogs are playing, it is a sign that they feel that Elijah the prophet has come to the city. These matters apply only if there is no female dog among them. If there is a female dog nearby, their crying or playing is likely due to her presence.