Long time lurker here who finally got round to making an account.
I'm one of those people who love my dog like a child. I am in no way under the illusion that he is human. I treat him like a dog. He is not my 'fur-baby', I hate that term. But he is most definitely, without question, my child.
I don't know if other people feel the way I do, but I get the strongest maternal feeling around him or whenever I think of him. It is so strong that it overrides everything else. Is that not the way mothers feel around their children? I get the impression I love him more than my friends love their actual human children sometimes, because when I mentioned this to them they start panicking they don't love their children enough.
Child-rearing is hard work. So is rearing a dog. Both have difficulties, both have rewards. Ultimately you are shaping a living being. Remove society's trappings and the rearing is identical, in my opinion. I am also of the opinion that giving birth does not make you a mother. Anyone can give birth. A mother is someone who loves and cherishes her child, who makes that child a priority over their own self because it is natural instinct to do that. Not all people feel that way about their own children, which is a sad and terrible thing to state. There are people who abuse their birth children, and people who adopt children and would happily give them the world regardless of not supposedly having the 'same biological urge'.
I think love lies on a spectrum. You feel you love your dog less, but maybe you are just pouring more of yourself into your baby. Or maybe you do have stronger feelings for your child. As long as both are cared for, does it matter? Love is not finite and it has cycles.
Sadly my dog passed away in April. I wake up every morning with a physical ache and like my own soul has been ripped out of me. When I asked my parents, who themselves have lost a child (my sister), they said it was exactly the same feeling for them. Not more, not less, just the same. As far as I am concerned, I was his mother. I still am.
Sorry for the long post.