Xren @XrenTheSquid You never truly move on, they stay with you for your entire life. I've had many cats and I miss them all and will never stop missing them. I don't know why, but pets are so special, even if we have such limited time with them.
Xren @XrenTheSquid I don't think that it would feel saddness in the way that we do, but I'm sure it would feel some form of loneliness. I seriously don't think animals have complete apathy, they just express it in a very different way.