easy - just give Jaffa some! If Jaffa's eating it, Mosi wants it.
I've had to smear it on Mosi's paw as he won't eat it from the tube. Jaffa love katalax but doesn't get furballs so doesn't need it. However, he has vomited up a couple lately so he either he's started getting them (could be from grooming Mosi) or he's sitting by Mosi's in an attempt to get some katalax
So yesterday I let him lick some katalax from the tube. Mosi was sat on top of the shelves nearby watching so I then went over to Mosi and held out the tube. Yum yum! He ate it straight from the tube eagerly. Little monkey.