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Whelpday is a Furspeech term for "Birthday." Alt.lifestyle.furry currently runs the furry tradition called the The Whelpday Care Package, where as, any furs with birthdays during a particular time period will receive whelpday wishes from the denizens of The Homestead. One of the best known Whelpday wishers is, of course, the Whelpday Mousette.
Foaling day is the furry equine fan term.
Another variant of this term being used frequently is Borkday. A more direct version that is a portmanteau of "Bork" (a mutation of "Bark"), and "Birthday"