I can picture exactly what you're describing! Chelsea thinks she's the 'boss' because she's a little bigger than Murphy, so she'll pick on him until he's had enough. Once he's reached his limit he turns into a little firecracker and sets her straight (for about 5 minutes). Thanks for the laugh! 
__________________ He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion. -- Author Unknown |