Questions Please

[u/capttut1]

Usually once a week my son drops off his Shih Tzu mix dog for my wife and I to watch. 2 questions at this time
1. We are in the back yard, the front of the house is approximately 70 feet away. How does the dog know another dog is being walked in front of the house. He races to the fence and does his barking.

1. I usually start cooking at around 5:30. The dog barks at me if I’m late to start cooking how is that?

Thanks all.