Alright, so I have been having some issues with my MIL. She thinks its okay to just come over anytime she wants for no actual reason. Let me start by saying that she lives across the road from us and comes up our driveway through our yard at least 3 times a day because her horse pasture/barn is behind our house. I don't necessarily like that she comes up everyday, but I understand she needs to feed her horses etc. A lot of times on her trips through our yard she comes right up to our door and knocks, I answer and she barges in and is pretty much just being nosy. Anyway, I don't want her to just knock anymore- I want her to call first because I have a BIG LOUD St. Bernard/ Great Dane mix who has quite the bark on her. Every time she knocks on the door, my dog goes crazy and I worry about when the baby is here and her getting woken up by the dog. If she called first, I could put the dog outside to make the barking a little bit better. Also, I worry that she will come over even more when the baby is here and to be honest- I want my alone time with my new family! My MIL just seems so clueless so I told my DH we need to have a talk with her ASAP! So I wrote down some rules for visitors. I'm going to tell my in laws they are for everyone, but really they only apply to my in laws as my parents don't live close and would never just show up without calling. Here are my rules...any advice or input would be great, and let me know if they sound too harsh. I will be honest and say I don't like my MIL at all, but I still want her in the baby's life, I would never take her grand baby away from her.
1. Please call before you come over- if we don't answer the phone, then don't come over anyway. We will call you back when we aren't busy. * Please do not knock on the door-it makes the dog go crazy and we don't want to wake up the baby-or we may be napping.
2. If the dog barks at you through the window, please don't talk to her- it makes her bark more.
3. We know you will want to visit the baby, but we would like to spend some quality time as a "new" family with her and not have visitors ALL the time. Please respect that. * You will of course be able to see the baby, don't worry.
We do not want to hurt anybody's feeling, we just feel we should lay down some ground rules now to make it easier for everybody when the baby is here. 
So how does that sound? I was actually thinking of giving her the rules, but I don't know if that would be a little harsh? I do plan on talking with her face to face with my DH too as well.
Re: Rules for grandparents/visitors
My gosh I think she would drive me crazy! But, thankfully you are now presented with the perfect opportunity to set boundaries that should have already been there.
Just have you're husband say something along the lines of "with the new baby coming we'd really like to keep the dog as calm as possible and try to establish a schedule/routine with the baby. It would really help us out if you gave us a call before coming over"
Good luck!