Two Sardar's and their horses

Then there were two sardars, Zail singh & Jarnail singh.Both of them bought a horse each."How will we know whichis your & which is mine?" asked Zail."Easy"replied Jarnail."I'll cut mine's tail,yours will be the one with tail"This was heard by a few boys ,they cut the other's tail too.Next morning the confusion continued."Don't worry "retorted Jarnail. "I'll tie a bell around its neck, yours will be the one without the bell."The boys heard this also & cut the bell.The next day, Zail got frustrated & said "Okay now the last criterion,white will be yours & black will be mine."