As part of her playing, she likes to chase things. When my brother started running around, she wanted to play and get some exercise. She doesn't get a lot of exercise, so when she has an opportunity to run, she will do it. Today, when someone knocked on the front door, Lady started barking. Then, she stopped barking.
Dogs have different barks for different occasions.
This time she was barking an alert to her family to make us aware that someone she didn't know was trying to get into our house. Today I saw Lady eating. She would put her pay into her food bowl before she started eating. Then, I gave her a hot pepper to eat. She sniffed at it, and then started barking and refused to eat the pepper.