Rob's already posted on it here.
Don't ask retarded questions about it and act like you know him well enough to make any other comment besides sympathetic ones.

I'm glad that I was able to meet Spike and pet him and brush him and look into those big brown eyes of his. He was a really friendly and playful dog and I'm going to miss him too. I was a fan of the series before I met Rob and before we became boyfriend/girlfriend and I really loved the episode featuring Spike and I showed it to my whole family because I thought it was hilarious.

It was really shocking to hear that he'd gone so suddenly. I mean, he was old, but it seemed like it happened out of no where. I think we should all be there for Rob as fans of the series and pay him some condolences.
So, R.I.P. Spike, we're going to miss you a lot even as you continue to live on in the Siblings series.
<3