I think this is a danger we all fall into, assuming that a creature loves us because it appears, to our standards, to be so. But this phenomenon is observed in humans subjected to acts of subjugation and denial of self-will, for example in cases of kidnapping. It's called Stockholm Syndrome, more about it here :
http://en.wikipedia.org/wiki/Stockholm_syndrome
This, I think, is part of the concern for me, is the behaviour we observe in our pets merely an animal version of Stockholm Syndrome?
I'm not sure it is different, in fact the more I think about it, the more I think that the whole matter of domestic pets is worse. We breed 'pets' purely for the purpose of our amusement and gratification without them ever having the possibility of living life according to their nature, with the freedom to behave as they choose to behave without complying to human expectations and rules.