The Art of Racing in the Rain taking the point-of-view of Enzo allows the audience to explore and learn about human behavior along with the dog.
We see this several times in the movie, like when Enzo isn’t permitted at the hospital, at the funeral, and in the courtroom.
However, dogs are also limited in that they’re not allowed to go into certain places.
It allows the viewers to take a more simplistic approach, to just observe and watch, without the complications that come with human observation–like overanalyzing.