They're the best friends. I'm sorry to hear about your bad memories, the worse thing about having a dog is to having them leave us. It must be a painful feeling, as they become part of our family. Getting support from the good memories would be the best thing to do, though I understand the pain.
Aww that's so nice. I'm glad you get to visit your furry friends and play/pet them :) We do indeed have a lot to learn from them!