Not sure about that: have you had dogs raise 6 puppies in your house?
If you argue like that, kids can be raised much cheaper, too. And there are even examples of kids being raised by wolves, I think? Hm, problem solved: get a dog and a kid, let the dog raise the kid?
Have you raised a kid? lets try another example, you get fed up with the puppies barking all day, you could legally kill them all in the spot (horrible I know, but some people do that).
Now compare that with raising a kid. If HE don't like the food and gets too thin, YOU may end in prison for kid neglecting. So you better cook nice food to your kids. Still think it's easier than a dog?
If you argue like that, kids can be raised much cheaper, too. And there are even examples of kids being raised by wolves, I think? Hm, problem solved: get a dog and a kid, let the dog raise the kid?