The song Old Shep was written by Red Foley co-wrote with Willis Arthur based on Foley's own childhood dog, Hoover, an Alsation who was poisoned by a neighbour.
In 1945, when Elvis was 10 years old he performed this song at a state fair in which he came in fifth place and won $5 along with some ride tickets.
In Only Fools and Horses, this is said to be Del-Boy's favourite song, and in one episode, Del-boy has Old Shep…
When I was a lad and old Shep was a pup
Over hills and meadows we'd stray
Just a boy and his dog, we were both full of fun
We grew up together that way