Thomas Moore wrote
I never nurs'd a dear gazelle,
To glad me with its soft black eye,
But when it came to know me well
And love me, it was sure to die.
In a related vein, here are some other animals that have joined the choir unseen.
I had a guinea pig: but its tale was short.
I had a mule: but it kicked the bucket.
I had a frog: but it croaked.
I had a a flatfish: but it's gone to a better place.
I had a chicken: but it crossed to the other side.