A poem for all

Learn lessons from those who fall
Served a lifetime as vet for long
Loving animals can not repay
nor live long
Never could build a circle strong
what did went wrong ?
Had it been human being
Would it be same song ?
Perhaps answer is yes..
What to learn from this instance
My time is gone..
Freed many from pain..and yet
got trapped in poverty’s net
Serve with care , love them all
Save a little for self ..never fall ?