In my early 20's, my uncle and I went backpacking about 7 miles into the Uintas.  He took his 3 legged German Shepard.  The dog did fine going in but after a couple days camping and exploring, the dog couldn't get up.  I carried it out, plus my pack.  Some memories settle down over time.  That one still hurts.  The dog went on to live a few more years.  I'm pretty sure it knocked a few off my life.
 
	