All the time.
I'll come home from school and tell Molly and Daisy that I love them, and that I missed them. Molly then immediatley jumps up and licks my face. Daisy just smiles and waits to be petted. When I was going through a bad time, I would take both of them to my room, shut the door, and just cry. They both sat with me and had a look like, "What's wrong?"

Nothing beats the love of a dog.