This type of barking is usually directed at things the dog sees but cannot get to. These may include other dogs, people, a ball, squirrels or other small animals, cats, etc. Most puppies begin exhibiting this type of barking by four and half months of age. The dog's demeanor is playful and excited; body posture often includes play bowing or bouncing around. Facial features are generally relaxed with ears being held loose; the tail may be wagging, but not stiffly. The hackles on his back are not up.