In an interesting inversion of status, the reigning breed in the dog park these days is the really-oddball-unidentifiable-mixed-breed-mutt-found-wandering-the-street or its equivalent. The stranger the mutt the better; the more peculiar the circumstance of it coming into your life, the better.
I'm very sceptical about the prospects for 'big' environmental causes - 'saving the planet', halving the world's population, ending the exploitation of animals, and so on - but a person can ask him- or herself how he or she personally may exercise compassion or humility towards animals, vegetal life and so on.