Green’s Dictionary of Slang

chock and log n.

[rhy. sl.]

(Aus.) a dog.

[Aus]Bulletin (Sydney) 18 Aug. 14/3: By-the-way – ‘when a chock-an-log sniffs ole pot-an’-pan, he does a carrington’ means merely that when a dingo scents man he decamps.
[Aus]Pete’s Aussie Sl. Home Page 🌐 chock and log: a dog.