What is the thing that everyone has?
Irrespective of species, it's pain
That everyone has.
"Explain it to me," asked an affirming comrade.
With a grin, I started this story
About two orphan puppies,
Cuter than the most cinematic lovey-dovey,
Brought up by calamities on this rotten street,
Still staying together—barking gangs have their own way of fun.
Only bonds that humans share had names.
Their bond was unnamed—maybe friendship,
Maybe love.

Back to the answer, let's jump the gun.
One dreadful day, there came a dog-catcher's van
That captivated the sweetest of their clan.
The group ran together for kilometers,
Injuring their limbs further to their dismay.
Brutal it was, watching them weep.
Pain transacted with the lost one.