I have a friend who went into labour and they had an old dog who sat by her side for about three hours and watched intently until her DH got home. About an hour later her father rang to ask when they dropped the dog off (at his house - about 20 minutes drive away) but she hadn't. This was the first and only time in his life that the dog ran away - he surely knew that something was going on - and once DH was home he had somewhere else to be