Pure Country is a great movie that George Strait stars in! You have to go find it and see it!! I've watched it literally 1000 times. My dad and me watched it all the time growing up and now me and my husband and boys watch it. The intro song which George Straits and his son sing, they sing.............
"When you hear twin fiddles and a steel guitar,
You're listening to the sound of the American heart.
And Opry music on a Saturday night
Brings a smile to your face and a tear to your eye."
I thought it fit perfectly in cause that actually what your story did to me!! I never had a mule but the way you described your guy made me think of my old baby. He died at 40 years old (7 yrs ago) and I miss him and his personality to this day.