Emotional Shift: occurs when a Therian shifts during a certain emotional state such as stress or anger, but it could also be a positive emotion such as happiness. There is little information about this type of shift. It may simply be a mental shift that is referred to as an emotional shift because the Therian recalls that the shift was triggered by a certain emotion.
Shifting triggered by various emotions has been discussed since the beginning of the online community, on AHWW in the early 1990's.
References
https://therian.wikia.com/wiki/Emotional_Shift
"Your feelings on the subject" AHWW, June 6, 1996, https://groups.google.com/d/msg/alt.horror.werewolves/4o964AZnZe0/HTTPbr7BYaMJ
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The Types of Therian Shifts
Non-FictionThis book goes in depth into describing and explaining Therianthropic Shifts including the history of the shifts and references for each.