Dogs can tell time by smell. They can smell different times of the day and how long their owner has been gone by how much their smell has dissipated since they left. – WTF Fun Facts
Source: https://www.akc.org/expert-advice/news/dogs-tell-time-with-their-noses-expert-says/
WTF Fun Fact – Dogs Smell Time
i think cats can too, my cat always seems to know when its 5pm and comes to watch the chase with me