Rottie hates new hairstyle and monthly cycle

 All of the above advice is good. Well, except for calling AC, that's a last resort in my mind.

You said they have a crate for SoCo? Well, he may need to spend more time in the crate while you're around. Maybe they can confine him to a bedroom in the mornings while you have your coffee.

Or maybe, its time to consider moving out?

I would definitely end the 'playing on the floor, kisses and close face to face contact'!

bridgesburning

I thank you again for your collective input.

After speaking with hubby about this I have resigned myself to pretty much the same conclusion you have offered. It seems there is really nothing I can do. You are right, the help of a professional will not be an option. Even if we convinced Mom of the necessity, Dad acknowledges the dog is dangerous and therefore will not allow contact with a stranger.

This leaves me with one final question. If/when this dog finally loses his mind completely, is there something I can do to ward off the attack or reduce the injury? I usually freeze when he jumps at me in that way. Suppose he does bite down on me, what do I do if I'm alone? Fight back? Go limp?  I hategthe thought but I carry a stun gun in my purse for self defense and am considering keeping it on my belt instead. 

 What does your husband think? Hes okay with you being around an unpredictable dog that can cause you injury? Definitely keep that stun gun on your belt. I'm sorry your in this situation.

You've been given excellent advise and counsel above -- I, too, am really sorry you're in this situation.

However, my input has to do with the family.  First -- you and your **HUSBAND** must be on the same page.  At all times.  If this is his family, he needs to be willing to be the interface here -- and sitting down and saying this is completely unacceptable -- the dog goes or we will call animal control (or similar). 

You both need to be willing to do whatever it takes to move out and get yourself out of that situation.  It's hard and harsh -- but even carrying a stun gun on your belt?  It's not enough -- because of the treatment he's gotten he probably does see various spurious movements as threatening.  It's a powder keg and quite honestly, because YOU are so at risk you and your husband are going to have to take the unpopular stand and back it up with leaving if need be.

Because the way this could end - with you dead, disfigured or worse would be life-shattering.  And honestly?  If my husband wasn't willing to stand up to his parents over this?  That's a problem --

In situations like this I'd love to say "sit down and talk" and we don't know you, nor the veracity of all said here -- but frankly, this may be one of those life situations where you may have to make a hugely unpopular decision -- and if your husband isn't willing to stand iwih you on it?  Then honestly, I'm going to leave the suggestion at that.  But I lived thru one marriage where my husband thought way more of his family than he did me -- so I"m not inclined to cut this family much slack.  Take care of yourself first and foremost.