Pete: The Russians I am afraid were wrong about the jackals ability...it is less than that of a full sized ( 50 lb dog) HOWEVER, the jackal is a good size to deploy, and has a manic focus...so the Russians interbred them with some kind of smallish dog for a hybrid thats easy to deploy in tight places and focused. Olfactory ability being less than a dog still puts it quantum leaps off the charts compared to a human.
I didn't realise that the scenting aspect of the breeding programme had been discredited. I believe they were bred for Aeroflot but never in any great numbers. Over here, Customs at a couple of ports were using Border Terriers (from working lines)for the same type of work..
Re the rats, I read somewhere that they actually smell in stereo with each nostril capable of processing different smells simultaneously..If that's true, its make human scenting ability look even more crude!