I have some favourites but always love reading new ones.

My favourite poem is:

Just a Horse
From time to time, people tell me,
"lighten up, it's just a horse,"
or,"that's a lot of money for just a horse".
They don't understand the distance travelled,
the time spent, or the costs involved for "just a horse."
Some of my proudest moments have come about with "just a horse."
Many hours have passed and my only company was "just a horse,"
but I did not once feel slighted.
Some of my saddest moments have been brought about by "just a horse," and in those days of darkness,
the gentle touch of "just a horse" gave me comfort
and reason to overcome the day.
If you, too, think it's "just a horse,"
then you will probably understand phrases like "just a friend,"
"just a sunrise," or "just a promise."

"Just a horse" brings into my life the very essence of friendship,
trust, and pure unbridled joy.
"Just a horse" brings out the compassion and patience
that make me a better person.
Because of "just a horse" I will rise early,
take long walks and look longingly to the future.
So for me and folks like me, it's not "just a horse"
but an embodiment of all the hopes and dreams of the future,
the fond memories of the past, and the pure joy of the moment.
"Just a horse" brings out what's good in me
and diverts my thoughts away from myself and the worries of the day.
I hope that someday they can understand that it's not "just a horse"
but the thing that gives me humanity and keeps me from being
"just a woman." So the next time you hear the phrase
"just a horse" just smile, because they "just" don't understand.

I think this poem could describe any of our best loved friends

The Raven by Edgar Allan Poe.

I have seen that one with 'Just a dog'.

Rainbow Bridge is my favourite.