Many dogs have sat by the side of their owner's grave though. In 2013, a video of a husky seeming to cry at the grave of a beloved grandmother went viral, and debate ensued about whether the dog was really grieving.
People have debated for centuries whether animals have and express emotions, but in recent years scientists have made discoveries leading them to confirm that human beings are not the only animals with emotional capacities. In 2012, a group of neuroscientists examined findings about neurological substrates in human and non-human animals and finally declared that animals, including dogs and farm animals, have consciousness and emotions.
Anyone who has loved an animal, of course, already knows this.