The boring but simple solution to this dilemma: crush the tablet and mix it into a small amount of cream cheese. The cat will look a little perplexed and slightly cheated when it realises it is eating gritty cheese, but will not be able to find the bits to spit out. Greed and cheese-love wins out every time.

Mixing the pill powder into milk doesn't work: the cat will leave the dregs in the bottom of the saucer and glare at you accusingly.