camels in a dog's mouth

Next day, October 18, we pushed on south-west for a further 25 miles off the sand and on to a rising, rocky country…scored into grooves 10 to 50 feet deep. The grooves and the sand in them ressemble the hollow of the roof of a dog’s mouth.

-A Further Journey Through the Libyan Desert, The Geographical Journal, R.A. Bagnold, 1933

What would KhairAllah have thought if I’d compared a camel track of corrugated sand to the inside of a dog’s mouth? Not that he would have even known what it’s like. Why would he? The dog barks, KhairAllah passes by.