so in HPPOA, at the end in the shrieking shack, sirius says:
"I could transform in my cell ... become a dog. Dementors can't see, you know ... They feel their way toward people by feeding off their emotions..." (HPPOA 371 US ed.)
so my question is, if the dementors can't see, how do they know who exactly to perform the dementor's kiss on?.... the dememtors were given permission to kiss sirius if they found him, but how do they know who he is?
maybe this'll be answered in the last book (though i kinda doubt that), so it's up to you guys....
=D