Animals in animal-ation

Animation is nearly limitless - traditional hand-drawn and computer-generated imagery (CGI) both enable the storyteller to depict a world without the physical boundaries that might hinder the story if the film were live-action. For this reason, animals within animation cannot be seen as accurate depictions of animals in real life. However, one can still examine the relationship between the characters - both human and animal - and how these relationships shape the contemporary thought of animals. Due to this, animated movies with all or mostly all animal casts cannot be included in this discussion. 

Ron Stoppable with his naked role rat, Rufus, from the Disney show Kim Possible.

Calarco explains the theory of humanity as having a place in the world, not just a place in captivity: in these animated movies, the animals depicted have their own place in the world of the film. The animals' ability to talk or to project very human emotions with their facial expressions and body language gives them opportunity to play with the world around them, to construct it and shape it as their own. 

Animals in animated movies are given human qualities, allowing the humans in the narrative to relate more easily to the animals. By projecting themselves onto the animals, humans no longer have such a large barrier to cross in order to connect with their pets, friends and sidekicks. Animals with distinctly human characteristics are more often depicted in animation, because of the relative ease with which storytellers can translate these unique qualities through their artwork. Whether it's a dog, horse or mythical creature, animators are able to make these creatures seem remarkably human even if the animals don't speak. Making animals seem more human lifts them from being poor in the world like Heidegger claims and brings them to a plane of existence level with humans.

A top 10 list of animated animal sidekicks.
Please note that not all of the movies mentioned feature distinct human-animal relations.