1 - lots of people keep their birds confined. I have for 2 summers due to predators and they seem none the worse for the wear, though I still did let them out in the morning for an hour or so and again in the evening if somebody was out with them.We live in a subdivision in the county, so there are no rules regarding livestock. The backyard is approximately 75' x 60' with privacy fence on the back and the neighbors' chainlink on each side. The houses are fairly close together, so I'm needing somewhat quiet birds to keep the neighbors on speaking terms.
1. The ducks would probably be housed in a coop/run 90% of the time due to the dogs with only supervised free time. How much space do you think I would need for the 3-4 ducks comfortably? I was originally going to do something like the Wichita Cabin Coop for the chickens, so thinking something like, but with an appropriate coop for the ducks instead of chickens.
2. Am I correct in believing that the Welsh Harlequins are fairly quiet? Even though I've read ducks may not voluntarily go inside the coop at night like chickens, are they noisy at night? While I don't want extremely loud noises in the daytime, I'm more concerned about evening and night.
3. As I stated, I was thinking about the Wichita Coop for the chickens which was about 10'x5' which is 50sq ft. Could 3-4 ducks get by with that, and I build on next summer maybe doubling that? I'm thinking the first part covered with a roof, and the addition just being open with hardware mesh. I don't want to do the birds a disservice by not providing a proper environment.
2 - I have one WH. She's quiet unless she's not LOL By and large, she is a quiet girl, but if there is something she must let everybody know about, they know about it. It doesn't happen often. My runners do the same thing, but they are chattier than the WH. I don't know that my WH chats.
3 - 10x5 coop for 3-4 ducks is plenty of space with room to grow the flock if desired. What can you do for a run with that? Any way you can put the coop in the center of your back yard along the back fence and then give them a 10' strip along the back fence? That would be plenty of space. A 5' roll of field fencing that is 100' long is around $100 and add in some fence posts (t-posts if you want to keep it easily moved). If your dogs can be trusted to not go over or under the fence, you should be good to go. Then just provide something in the run for shade - either cover a bit of the top with something that will provide shade or put in a few shade huts. You'll need to provide shade regardless of chickens or ducks.
My ducks are quiet in their coop at night. But once it is light out, they are chatting away to get out. The few times I've penned them at night and forgot to close them into their coop, they still chatter away in the morning to get out of the pen.
If you have 7 dogs being dogs and your neighbors don't have an issue, they likely won't have a noise issue with a few ducks. My ducks are no more loud or obnoxious as my dogs.
But with close neighbors, just make sure you keep the pen/coop clean so it doesn't start to smell and annoy the neighbors.