Definitely one of those situations that seems funny on the surface, but once you consider the ramifications, the outcome turns quite gruesome.
"I kinna' kill th' wee beasties...I'll let th' Kling'ns do it."
I wonder if anyone ever "called" Gerrold on that likelihood?
Tangently related, if we assume Caitians parallel terran felines in more than just vague appearance, notably, their diets, then tribbles probably "smell" Caitians to be obligate carnivores and probably react similarly as they do to Klingons. In other words, you're not likely to see Lt. M'Ress with a pet tribble. (Poor thing would probably shriek itself in a cardiac arrest!)