Weaving is a behaviour in horses that is classified as a stable vice,[1] in which the horse repetitively sways on its forelegs, shifting its weight back and forth by moving the head and neck side to side. It may also include swaying of the rest of the body and picking up the front legs. Some horses exhibit non-stereotypical weaving, and instead engage in variations on this behavior.[2]
^Clegg, Heather A.; Buckley, Petra; Friend, Michael A.; McGreevy, Paul D. (January 2008). "The ethological and physiological characteristics of cribbing and weaving horses". Applied Animal Behaviour Science. 109 (1): 68–76. doi:10.1016/j.applanim.2007.02.001. ISSN0168-1591.