I've seen a couple versions of this floating around the internet, but the author's always unknown so I decided to post. As soon as I read the first 2 sentences, I just started bawling.
Please watch over our humans; they are so weak. They have no claws or sharp teeth, they can't run fast or fly away, neither can they burrow or build a nest in which to be safe. They smell bad, do strange things that aren't altogether intelligent, and have no real ability to communicate with us, although we are able to figure out what they want.
Lord, grant us the ability to watch over our humans, care for them, cheer them when they are down, make them laugh, smile, and shower them with our love. We pray that we can bring a little joy into their otherwise mundane existence.
Lord, please let them know that when we insist on getting attention, it is so we can check their emotional well-being and boost their morale. When we pester them for different foods, toys, etc., it is so they will learn to see us in ways they had not considered, bringing them closer and back into the fold which they are part of, but keep forgetting about. They expect us to know what they want even though sometimes they don't know what we want. Some of them really try and we know they love us, but some of them do not, yet our love for them remains intensely unfaltering.
Lord, when we die, please make sure to send us ahead to where ever our humans are going to be, so we can pave the way for them, vouch for them and be there for them when they too die.
Please allow us to continue proving the humans are worth the effort. You placed these humans in dominion over us, but you charged us with the task of caring for them and showing them your love, every one of them.
God bless these mere mortal humans, they know not that we are their guardian angels sent in love to task them so that they may grow to be part of your plan.
You and us, God ... we'll bring them back into the fold. You and Us.
Another really nice poem to send to someone that has lost a pet is "The Rainbow Bridge"...the dobie rescue org that I work with sent me a copy when my Rufus passed away and it really comforted me. I laminated it and keep it in a special drawer with his collar and favorite toy (Mr. Blue Whale).