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underCoverSailsman
Since: Jan, 2021
2022-08-14 20:38:54
Well, when in doubt: suggest the oldest variation I'm aware of. Could this be "The Hound of Florence"? (Untroped, but later made into The Shaggy Dog by Disney in 1959)
indigoJay
Since: Dec, 2018
MikeK
Since: Jan, 2001

I'm not sure if the entire plot revolves around the main character being a Baleful Polymorph trying to return to human form or just the bit I remember. One thing I remember is that tail-wagging is involuntary, which he finds annoying: apparently all he has to do is think of anything happy, even the word "smile", and his tail starts moving.