Animals in general are much more honest than people. They might sometimes engage in minor deceptions (although I sometimes wonder how much of that is projection based on our perceptions of their intentions), but they always make it clear where you stand with them. An animal will never pretend to like you to your face if they actually don't. Obviously it can be useful for humans to be able to deceive like this (e.g. maintaining cordial professional relationships with coworkers who you might never choose to spend time with if you didn't work with them), but as someone who struggles to read social cues and gain confidence about what people actually think of me, it can get exhausting.