it is said that animals communicate through their energy. I'm no scientist, so I can't really speak to the validity of that. What I do know for sure is that my dog is keenly aware of my depression and she knows just what to do when I'm suffering. Watch this.

Interacting with Animals Fights Depression
https://www.healthyplace.com/blogs/breakingbipolar/2014/03/interacting-animals-fights-depression