I can see why that upset you and hurt you! People can just be so callous. You should thank your lucky stars everyday that you are not like that. Take pity on those that are, as they do not have the emotional capacity to love so unconditionally like you do.
Your world is a brighter, more loving and fun place to live in than their's ever will be. I do more of less feel sadness or pity for those who do not see the wonder and joy in owning an animal. Their tune would change in a heartbeat if they did own a dog Im sure!