I doubt there's any pet owners who will lie and say their pet's poop doesn't stink! If you don't overcrowd your chicken coop, and shovel it out at least twice a year depending on how many chickens, you'll be fine. Make sure your chicken coop has good windows and ventilation and a good sized run. Maximum space per bird means less yucky mess. Mine have a large run area, so the poop gets spread out and the stink is only noticed when someone literally just pooped. I use pine shavings and make sure that it gets stirred often, add extra when needed, and if I start smelling ammonia, the whole coop gets shoveled out and dumped in the compost. I have shallow plastic tubs filled with pine shavings under their night roosts, which catch most of the yucky stuff when they're roosting at night, since they are usually outside during the day, then I can just empty the bins periodically instead of having to clean the entire coop as often. Word of advice. If you think you want a dozen chickens, start with 6, then work your way up to 12 once you know you can manage 6. They poop more than you'd think. But as far as being dirty? Only when it's really muddy or someone was hanging out under the roosts at the wrong moment. If you get a light colored chicken, you'll be able to see when they are dirty more often than if you get a dark colored one. Happy chickens spend time taking dust/sand baths to keep the bugs out of their feathers, and if not overcrowded can preen in peace, looking as beautiful as any shampoo model. My older chickens at the top of the pecking order are always looking pristine except for their feathered feet when it's muddy. If you don't have a cover on your feeder and waterer where they can't perch on it, yes, they will poop in it. This is why I have mine partially under a shelf under the nest boxes where no one can jump on it. I don't think Chickens smell any worse than a dog or a cat if they have the proper housing. And yes, some of my chickens are as affectionate as some of the dogs and cats I've owned. You just have to make sure you don't wear your church clothes to go pet your chickens, because if they decide to 'show their affection' it means them perching on you at some point, and they don't always watch where they step. For this reason I have a nice hooded 'smock' which works well for this. I look like a complete fashion nightmare, and I'm sure my neighbors think I'm a complete dork, but at least I don't have to change my entire outfit every time I visit the chickens. My favorite chicken 'Sprite', a Spitzhauben, decided that while I was bending over changing the waterer, she would use me as a ladder. She's always wanting to be held or to perch on me somewhere- hence the chicken smock with hat and hood. But I didn't realize how good my own flock's eggs were until I bought one of those gas station refrigerator breakfast sandwiches and nearly gagged. Chickens are also a lot more entertaining to watch in the yard than a dog or cat, but you couldn't let them snuggle on your furniture.