I had a pet cow when I was younger, and I thought of it as my child. Have you ever eaten a hamburger? Did you eat my beloved bovine bestie? I see all of my cows as my children. All of you who have eaten steak, hamburger, jell-o, beef stew, steak pie, candy, or anything with beef by-products are MONSTERS!
Think about this rationally (which is probably difficult given the emotionally charged nature of your post). Your Primitive Cave Monster Person theory has to be applied to every single animal, or not at all. There is nothing about a dog that makes it morally less edible than a cow, a pig or a kangaroo. Saying it is cute and 'your child' is like condoning the comprehensive thrashing of other people's ugly children, because they're not as cute as yours and you don't see them as your children. If you're a hardcore vegetarian, then fair enough, but selective moral outrage by way of species is ignorant and in the case of your argument, hypocritical.