Sick as a Dog
Susan: Oh Shannon, you look as sick as a dog. What's the matter?
Shannon: I feel terrible. I think I might have caught that flu virus that has been going around. I've been working like a dog and had a lot of stress lately. Maybe that's lowered my immune system.
Susan: I know you told me about that argument you had with your coworker. You shouldn't worry so much about being top dog. Let him have some glory, too.
Shannon: I know. I don't know why I get so upset about everything. And there's another thing. If I get into any more fights with anyone in the office, I'm going to be in the doghouse. My boss is already keeping his eye on me.