Warning - all of these video clips WILL make you cry. If they don't, you're probably not human or animal! I cannot even survive till the end for half of them.
And there are so, so many more real-life stories of the unconditional loyalty of our companion animals.
The moral of the stories here is this: We have to take care of ourselves so that we can take care of our loyal companions and they do not have to suffer not knowing why we have died. They do not understand, but we do.