You know, the double standard here is interesting. Can't afford am emergency vet visit should something happen? DONT YOU DARE GET A NEW PET. Cant afford to feed the kid you have? By all means, go have another kid! Let everybody else pay for it!
Also, you cannot accidentally "have" a dog like can happen with a child. If a family is a loving one that would otherwise be good parents and someone accidently gets pregnant, I would much rather have my tax dollars go towards the family needing WIC or food stamps or something as opposed to the woman having an abortion. And this is coming from someone who does have bills, pays taxes, etc.
And technically children are a right. You have a right to reproduce as you see fit as a consenting adult, and that includes bringing children into the world.