Goats are pretty easy and inexpensive to keep. Initial cost depends on the breed and quality. Mine was free, but I'm not sure what breed she is. I think she's just a mutt, actually. A really cute mutt. X)
I think they require less effort than a dog. They stay outside, keep on air, and the only time I brush Adelia is in the spring when she sheds. I just use a horse shedding blade. She loves
it. Looks like I killed a rabbit when I'm done, though. It leaves fluffies all over the ground.
Which is kind of good, because birds use it for their nests.