They can, I swear it. That is, they're always there for you. Dogs are happy when you're happy and sad when you're sad. I will never forget the two times I actually cried in the presence of my big collie. She was there instantly, nuzzling her snout into my face, consoling me over my grief.
Dogs have great tolerance.
This is perhaps their greatest attribute. Dogs can tolerate an awful lot. When my son was born and we brought him home from the hospital, Flurry approached him and sniffed, and somehow knew that he was now No. 1. She was never once mean to him, despite having her hair pulled or being ridden like a pony, or being dressed in a number of silly hats. She simply sighs and puts up with it, knowing that, as a dog, that's her job.