Sometimes I need my dogs much more than they need me. I generally see all my rescues as an excuse for my existence. As a non-believer I don’t look for the meaning of life in the spiritual sense and I don’t really consider my life vital for the planet or humanity. Sounds awful but it isn’t. I have a moral code, I enjoy and appreciate my life -every single minute of it. And it does matter that I matter to a handful of people and my pets.
I spend a lot of time and energy on my dogs but I get a lot in return. They make me happy just because they are there.
Ah, as to the title of this post: rather than the biological symbiosis I meant more the sociological one (the doctrine that mutual dependence is necessary to social well-being)