I just played the Wolf Party game. Payed my 100 mushrooms. Got the wolf. Clicked "view wolf." Clicked "back to den," and was taken to The Heavens. My mushrooms are gone. The wolf is gone. So I guess I payed 100 mushrooms for a wolf that died instantly?

Did you accidentally click on the "retire wolf" button first?

I accidentally clicked "View In Custom Maker" first, but not anything else.

I think it said the wolf was 16?

The only thing that could have happened was you accidentally retired the wolf. The 19th was a Saturday and it's impossible for wolves to die from old age on Saturdays, death script only ever happens on Monday mornings