How Sick Exactly Can A Dog Get?

I've always wondered at the term "sick as a dog". I use it often though, just a phrase I grew up with. I cannot use a better description for how I'm feeling now though. Lost my voice sometime last Wednesday and haven't found it yet. Maybe it went on vacation to Florida without me. Anyways, got back from the doctor's today and I've developed a pretty nasty infection. If I could just get some sleep I'd kick this thing... Well, missed work today, most likely tomorrow too. Starting to feel guilty about taking vacation next week for the girls' Spring Break... ok, not all that much really, but maybe just a tiny, lingering guilt...