The puppy takes a few seconds to realize what he is seeing, and then the watchdog mode is on.
Our brain does not work instantly after waking up, particularly when we sleep during the day.
So, at first sight, things can be even more perplexing as well as surprising. Currently, imagine that this dog comes and sees this intruder at the door.
Pooh wakes up and witnesses a bear whose face is only separated by glass.
The puppy takes a few seconds to realize what he is seeing, and then the watchdog mode is on. The bear didn’t stand a chance.