A placebo can only work if someone (or something) believes it will. So how can animals be fooled by the placebo effect?
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Sources:
http://www.bbc.com/earth/story/20161017-why-animals-experience-the-placebo-effect-much-like-we-do
https://www.ncbi.nlm.nih.gov/pubmed/19912522
http://skeptvet.com/Blog/2018/03/presentation-of-placebos-in-animals/
https://www.the-scientist.com/?articles.view/articleNo/33468/title/Rats-Get-Placebo-Effect/
https://journals.lww.com/pain/Abstract/2012/10000/Placebo_induced_analgesia_in_an_operant_pain_model.8.aspx
https://www.ncbi.nlm.nih.gov/pubmed/7063864
http://veterinaryrecord.bmj.com/content/early/2017/03/07/vr.104168
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