Memory and sense of time are intertwined. This is why people with dementia frequently have a skewed sense of time. Animals' memory is considered to be considerably simpler than human memory, and dogs have long-term memories, meaning they can only recall specific events from their lives. While your dog will recall you leaving home, will most likely have no idea how long you were gone. When dogs are left alone, they occasionally get anxious (due to behavioral problems), showing that they are conscious of the passing of time.
Dogs have a feeling of movement but are unable to comprehend the notion of time. Dogs, unlike men, are unable to generate true measurements of time such as the seconds, hours, or minutes, and are unable to read timepieces. So, while assuring them “I'll be back in 15 minutes” won't help much, we understand why you feel compelled to do it! Dogs may be taught to predict future occurrences based on previous encounters, and they can be educated to do so. The dogs of Pavlov are an excellent example of this. Dogs can detect the passage of time. Dogs, on the other hand, can detect changes in the air.