whelpday

noun1

1. •
   (Internet) The birthday of a canid, especially a dog, or (furry fandom) a furry's canid fursona, typically a dog or a wolf.

   • Woohoo! Happy whelpday, Harry! Have some Nutella mousse - it came out pretty good, if a bit thin. I didn't hear anyone complaining about the taste :-) — 1998