I think my (40+) chickens are less work than my single (indoor) doberman pincer, but more work than our 2 house cats.
For example...
We had to go out of town (560 miles away) unexpectedly for a funeral. I had to find someone to come and take care of my chickens at least twice a day - collect eggs and close the windows at night. I had to take the dog to a kennel (lots of $$ and hard to find a week's opening last minute) because she needs to go out to do her business every few hours, play, and be fed twice daily. The cats... well, we just filled the auto-waterers, dumped a bunch of cat food in an open bin and left 2 freshly-cleaned litter boxes.
The cats were fine all week by themselves. No messes. No destruction.
The dog had refused to eat and only cried for the first 3 days. Then she was afraid of the kennel workers. I had to have my mother pick her up early because after 6 days, she wasn't getting up off her bed and refused to eat again. Oh, yeah, and it cost a LOT!
The neighbor kid came over to feed/water the chickens and collect eggs. He also watered the horses. I don't think he came over as often as arranged, but the chickens did ok. I didn't get many eggs... I think they were getting broken in the nests from being left in there too long. It was waaaaay cheaper than the dog.
The best animal in this scenario was the horses. They (2 mares) are pastured on about 20 acres. All they need is fresh water about twice weekly.
I think the cats come in 2nd... they didn't need any human intervention at all for a week.
Then the chickens... minimal attention by a teenage boy and they all survived.
Last is the dog. She can barely last a whole work shift without needing to go out to relieve herself... dogs need the most attention at our house.