When we were younger, my brother and I had two pet rabbits. One was an American Albino (Sammie) and the other was a Dutch Rabbit (Beauty). As young boys it was exciting to get two cute rabbits to play with. They were high maintenance, but it was worth it in the end.
In April and May of 1999, Sammie got a serious illness which immobilised his right hind leg. He spent a great deal of his time dragging his body along the grass. My father chanced to take him out of the enclosure, out in the open, so unable to move, was Sammie.
One of the most emotional scenes, I have ever experienced was seeing Beauty desperately try to revive Sammie after his passing. We humans knew right well there was no turning back. Sammie was gone. Beauty died shortly afterwards of a broken heart.
My brother and I never thought of getting another rabbit and this helped make both their deaths all the more emotional.