We've been in a first floor suite in both LK & Nemo as well as a top floor suite in LK (twice). We didn't really have any major noise issues in any location. The worst of those 4 locations was top floor, building 10 (LK) right by the exit door at the staircase closest to Animation Hall. We heard that door slam every few minutes whenever we were in the room -- day or night. It wasn't so loud that it kept us awake or woke us up, but we definitely noticed it if we were awake. I made sure to request rooms *not* near a door on future trips. Also at that location there seemed to be a CM "hangout/break" room right next to our suite. We'd see CMs going in and out all day -- always carrying backpacks. If we were in our bedroom, we could hear them laughing and talking in the room next to us. They weren't loud, but it was noticeable. They only seemed to be there during the day, so it wasn't an issue at all. When we were in first floor suites, the only time we heard anything above us was for about 20 seconds in our LK suite. It sounded like a little kid bouncing a small ball. It stopped quickly and we never heard it again. I will say that we haven't been there since they removed the carpeting from the rooms so it's very possible that you hear more noise now. We've stayed at non-Disney hotels that don't have carpeting and I've noticed a little increase in noise, but nothing that kept us awake at night. It really depends on your neighbors, though. Our loudest neighbors have always been at high-end non-Disney hotels with carpeting.
A far as pets, they're allowed in each of the sections. There were definitely dogs in our LK building (building 6) during our stay in June 2018. We didn't hear them, but we saw the same 2 families with their dogs coming and going from our building throughout the week. There are "doggie relief" areas in each of the 4 themed areas of the resort. I *think* they only allow them in one specific building in each section and possibly only on specific floors within those buildings. I know I've seen people report that they've requested to *not* be in a pet-friendly building and also that you can request a deep cleaning prior to arrival if you have pet allergies.