What most famous dog died?

I'm puzzled by something I read recently, and I'm hoping you can help me clarify. Can you tell me, what's the name of the most famous dog that has passed away? I'm trying to piece together some information, but I'm having a hard time pinpointing the exact identity of this canine icon. It seems like such a trivia question, but it's actually quite significant to me for personal reasons. Would you mind shedding some light on this matter? Your expertise in this area is invaluable, and I'm really looking forward to your insights.