Harder, yes, but we become stronger, so is it really harder to us? In some ways yes, but keep in mind that it's all a matter of perception. Sad that something is gone, or happy that you had the opportunity to have it? Hurt after a hardship, or proud you endured and overcame it? Upset you don't/can't have what you want, or working and measuring progress towards an achievable goal? Two people can look at the same exact thing and see something completely different.
Marley? I can see why comments are disabled on that video. The Bob name was right though. I'm still glad you posted it. I haven't heard it in a long time, and it's a song I really like. I like what you said about dogs (animals in general really). They seem to take their environment as given, prioritize actions based on needs, and cope with it the best way they can.
http://en.wikipedia.org/wiki/Don%27t_Worry,_Be_Happy