We're taught to be cool around strange dogs because they smell fear, and that might be true, but your fear is probably freaking them out too!

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Sources:

http://www.sciencedirect.com/science/article/pii/S1558787816301691
http://www.pbs.org/wgbh/nova/nature/dogs-sense-of-smell.html
http://www.sciencemag.org/news/2016/08/video-your-dog-understands-more-you-think
https://chd.ucsd.edu/_files/winter2009/hare.tomasello.dogs.2005.pdf
http://rsbl.royalsocietypublishing.org/content/12/1/20150883
http://journals.sagepub.com/doi/abs/10.1177/1745691616676599
https://link.springer.com/article/10.1007%2Fs10071-017-1139-x
http://www.sciencedirect.com/science/article/pii/S0166432816300699