I grew up with a dog. I was 1 y/o, he was 1 too. We got him from the rescue shelter. It was an interesting experience to grow up alongside him. My parents always refered to him as my brother, and for me he was. The same as if he was human. He died at 16, I was 16 too. It was like loosing a family member, for everyone. We all cried and we all decided to give hommage to him like a true family member deserves. So we incinerated him, and took back his ashes home to put them in the garden he loved.
It was not a waste of money. It was normal for us. When you grow up so close to an animal, when you call him your brother, then the fact that he is different than you doesn't change anything.
We have a new dog now. He is my brother also. And he is fully conscious and happy to be a part of the family. I have put my life in danger once to save him from an agression, and honestly the fact that he was or not human didn't even crossed my mind. He was my brother, I had to save him, period. And it is a waste of nothing. Every wound was totally worth it when he came to thank we, when I saw the fear in his eyes.
I am no owner of an animal. I am his sister, his mother, his bro, but I certainly don't "own" any pet. They are all family, and there is nothing to explain or to justify. I see no difference in my bond between my human brother and my dog brother.
Every friendly animal I cross path with, I greet him/her as I would do with a human. It happened more than once that I even drop everything I was doing and just stand there in the street because a cat approached to me in a friendly manner and wanted some love. So I just take a break on the human busy life, just sit on the sidewalk, and have some refreshing conversation with a random friendly cat as if it was a human. I don't see what's the difference. They are not useless. If any being here on earth exists, then it's because it have a mean to be. They are not a waste or useless. Maybe by our own humancentric egotistic ideas they are, but thank God it's not our opinion that rules the world.
When you raise an animal like you would raise a children, when you consider them like the clever creatures they are, then you realize they are way more "human" than you can imagine.