(Hee hee hee hee! You guys have Ward Churchill! We only have the knee-stabber! Hee hee hee!)
I will make life complicated for him, in my own way. Dr. Boss hates paperwork. Doing research using animals involves a lot of forms: submitting a protocol describing your experiment in detail (how many animals used, what techniques are done, etc.) for approval. Make any changes the approval comittee asks for, or submit an explaination of why things must be done your way. Once the protocol is approved, you have to make sure that anyone using the animals has been appropriately trained, had their vaccinations, and have them added onto the protocol. (I’ve done this a lot. Can you tell?)
I have notified the Animal Care and Use Comittee that I’m resigning. I am the only person qualified to handle animals on Dr. Boss’ protocols. Dr. Boss can’t touch the mice, or enter the animal facility, until he changes the protocols. To do this, he will have to hire someone to replace me and make sure they’re trained, or get the training himself. If Dr. Boss decides to continue research, he will have to fill out reams of forms in order to get the animal models going again.
ETA: Nasty part of me - I know some members of the comittee and I’ve told them that I’m not happy with Dr. Boss. I’m sure they won’t let that cloud their decisions.
Knee-stabber? Do tell! 
Full disclosure here: I’m not quite old enough to remember when women got the vote (or when dirt was invented), but I’m sufficiently old to have marched for the Equal Rights Amendment (and remember when dinosaurs were invented).
So, at the risk of sounding jaded:
- You can’t fight every battle. You can’t spend every moment of your life on a soapbox.
- Make Dr. Boss’s life miserable, file reports with HR, stand up for whatever benefits and monies you feel you deserve – as you feel comfortable and appropriate.
- Get those recommendation letters as soon as you possibly can (before Sweetie_Mousie is born, before you needneedneed to land a new position).
- Enjoy having the privilege of holding the high moral ground, even though Dr. exBoss may well be beyond redemption.
- Know that a bunch of Dopers are rooting for you!
I hate to be on the side of such a jerk, but one tiny little thing keeps bugging me about this: isn’t it possible to interpret his remark about “you’re pregnant…” to mean that “you’re going to be out of the lab on maternity leave for a while…” and since you’ve already said nothing can happen when you aren’t there, maybe he meant it that way. He doesn’t mind you quitting because between the upcoming leave and your lack of the surgery training, everything would shut down anyway unless he hired someone else who has both qualifications.
But he’s still a big, fat arrogant jerk who deserves to be reported to the powers-that-be for taking credit for someone else’s work and wasting the money by not tending to his experiments.
Oh, sorry, I didn’t explain: I’m a grad student at UNC. You may remember this little incident last fall. Cozad is going to trial on attempted murder charges in September. President Kay “Mama Bear” Norton gathered all the little Bears together in the gym and scolded them sternly. Such is life in Greality.