You know RoPo, I actually entirely agree with you that there was some REASON the dog decided to bite you - perhaps b/c he smelled your dogs on you, perhaps b/c of something about your body language, perhaps b/c he has some weird thing about people wearing sage-green T-shirts, perhaps because he had a dream last night about someone who looked like you taking his food away... I mean, really, who knows what. Presumably he did have a *reason*, we all have *reasons* for what we do.
But.
The thing is.
Dogs can't be goin' round biting people. No matter what the reason (except, *possibly*, in defense of their lives when being attacked. This has nothing to do with your situation though).
Who's to say that the next person -- the next *kid* -- who comes along may not give the dog the SAME stimulus, whatever it was, and he may not bite HARDER?
Look at that bite - if he'd closed his teeth down and bit with more sincerity you would probably at best be permanently disabled in that arm. You don't want that happening to someone else and saying "wow, yeah, I could see that situation coming"...
I also entirely agree with you that it is an awkward delicate situation since it is a coworker, especially depending on how office politics are at your place. But it seems to me that you've GOT to do SOMEthing... at the very least, make it widely known around the office that her dog bit you repeatedly AND tell her that you will cut her a break and not report it but she has GOT to do something about training/restraining this dog before something more serious happens.
JMHO, and sympathies, and go get yourself some more ice and a big bowl of icecream or some such,
Pat