Equal (equine) justice?

STALLION $5 000 STRAWBERRY PATCH MARE $10 000 Three strips of land, so starts the riddle... Horses on outer,'berry patch in the middle! Story unfolds on an early Spring day, When stallion and mare, both went astray! They met in the middle...nature's course it did take... 'Berry patch ruined...owner mad as a snake! Horse bosses in court, for both jointly sued, For the fifteen grand damage, that had accrued! Ten grand to be paid, by the owner of mare... Stallion's boss five...is that really fair?! Reason for this, the court duly found... Stallion had only two hooves on the ground!