and to all the dog lovers: you think your dog loves you? open the front door and find out. :P
I have, she always comes home.
I would see your point if the animal was mistreated or if it was a feral animal that someone has tried to make into a house pet. But domesticated animal slaves? I don't know bro, I think it would be a little harsh to kick my dog to the curb and say "see ya, fend for yourself".
I don't know what kind of animal treatment you've seen but my dog lives the life. There is always someone home with her, goes on walks, has a tons of toys to play with, constant lovin, treats, birthday cakes. I don't know, you're argument isn't valid to me.
Try this: I'll alter your quote to include other situations wherein someone/something who loves me (or you) would still exit an open door;
"and to all the ________ lovers: you think your __________ loves you? open the front door and find out."
Now fill those blanks in with anything/anyone with a low mental capacity. If they leave it doesn't mean they thought it through, they were most likely overcome with an overwhelming sensation. once out, that doesn't mean they wouldn't be back.