Free range chickens or other poultry provided you view them more as beloved livestock and not companions. If you are rushing to the vet to treat minor injuries/infections/parasites instead of DIY then they aren't particularly cost effective. A few free range hens eat very little in feed (a 50lb bag is maybe $13 bucks at the feed store and lasts forever for only 3-4 birds) and provide eggs to make up for their feed cost. They also don't come in the house so you don't have to deal with fur, scratching, litter pans, etc. They can be left alone for a few days with plenty of food and water unlike a dog. You can also build cheap coops from scrap wood, pallets, and $30 bucks worth of wire. Downsides: most free range birds are not particularly cuddly or social with humans unless you train them to be, occasional coop cleaning, predator losses, and of course the willingness to put them in the soup pot or just keep them as non-productive pets once they stop laying.