Temp 101.8 - probably not a systemic infection
BAR - probably not a systemic infection
Toe touching lame on rt rear - 3/4 lameness
Soft tissue swelling(pitting edema) - damage to soft tissue with local inflammation
Swelling 12cm proximal to fetlock to just distal to joint - swelling/lameness associated with right rear fetlock joint
Worse post palpation - indicates location and likely more acute than chronic
Owner thinks mare stepped on foal's leg - possible trauma etiology