system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] How do Dementors sense souls?

If they couldn't "see" Sirius Black's soul while he was a dog, how do they know when there's a human soul in front of them for them to slurp?
gpt
Dementors feed on the positive emotions experienced by people, and therefore recognize humans as walking food reservoirs. Because animals have much less developed senses of "self," as well as hazier memories and obscurer emotional experiences, Dementors receive little to no benefit from interacting with them, and largely ignore their presence.