This is supposed to be the most common elbow injury in dogs according to Olmstead's «Small Animal Orthopedics». (vetinfo.com)
Encouragement for parents is that Hopkins Medicine found that «elbow pads can prevent 82 % of elbow injuries, and knee pads can prevent 32 % of knee injuries.» (wetheparents.org)
As a 7 - 8 year old black dog lame from an old elbow injury caused by someone who ran him down and hit him with their car, his adoption chances were slim. (safeharborlabrescue.org)