@Ven: Dude, are you a psychopath? [JK]
Anywho, yes... I once had two tortoises, both of whom ran away (yes, ran away) and were later found dead—flatten to death by some sort of heavy weight, possibly a motor vehicle, seeing as they were found in the street. For clarity, I owned them at different times, not together; just so happened that both of them died in the exact same way. I was about nine years old during those times, and I cried a river as long as the Nile...
Humans often become attached to persons, places, or things that make them feel good. Such things include inanimate objects—such as cars or videogames; and animals—such as my tortoises. The stronger the good feelings, the stronger the bond. This bond can be so strong that losing the source "good feelings" can cause one to become sad or depressed... or even cry. This is usually what happens when one loses a pet; the person becomes saddened, because their "friend" and source of "good feelings" has perished. Perfectly normal human stuff...
Not sure if I'd cry as an adult if I lost a pet, though, but I'd likely be very saddened by it (it just wouldn't show on my face)...
#EmotionlessFace