Fengxian, thank you. I too have many rescues. I've found many narcs are very big animal lovers. I've wondered if it's because they don't need to put on any acts for an animal and still are fully accepted. Also, are the animals an outlet for emotions narcs are unable to experience with people - love, caring, sympathy, etc.
About the rescues - perhaps it's a desire to rescue something from a terrible situation - something no one did/can do for them. After all, narcs tend to want what the world views as 'the best' of everything, and a mutt from the pound isn't that, yet narcs willingly take these poor animals in and shower them with love.
ADDED: On my last point, yes, there is the possibility that the narc wants to be viewed as a very caring person so they take in a rescue, but the way these animals are treated and adored leads me to believe this isn't the case. The animals aren't used as props like some of the poor toy dogs we see carried in shopping bags are used as. Narcs seem to genuinely care deeply for these animals.