|A Wheel Dog explained|
'What's that, Martin?" I asked.
"A Wheel Dog." he answered proudly.
"A real dog?" I asked, as he sometimes doesn't get his letters correct.
"No," he answered firmly, "A wheel dog."
Then he pointed to one end and then the other.
"See, his wheel head and his wheel tail."
"Ah, of course. It is a wheel dog."
"Yep!" and off he went very pleased with himself.