I am a poem

I am shy but I am strong too
I wonder why do they suffer?
I hear the soft purr of a cat
I see the shadow of a box 
I want to save all of them
I am shy but I am strong too
I pretend to help them as much as I can
I feel the pain in their eyes
I touch their souls every time they leave
I worry about clouds and rain
I cry when they pass away
I am shy but I am strong too
I understand that I do what I can
I say that I will meet them again crossing the rainbow
I dream about a forever home for all of them
I try to make their dreams come true
I hope for a better life for them
I am shy but I am strong too.

I am not sure what you mean with

"I see the shadow of a box"

It is correct, but how does it fit in your poem.

Can you describe it in a non poetic way ?

^-^