Why is a dog the only animal to make eye-contact with a human?

Question: Why is a dog the only animal to make eye-contact with a human?
- Keywords:
  animal,
  dog,
  eye contact,
  human
Asked by anon-177032 to Becky on 17 Jun 2018.
- Becky Thomas answered on 17 Jun 2018:
  
  Other social (and domesticated) animals are able to make eye-contact with people too. They do this because they are used to living with us, and we use eye contact a lot when communicating.

Question: Why is a dog the only animal to make eye-contact with a human?