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It does happen occasionally that she spits the tablet out - but I'm always aware that she's done that, as I watch for the little contraction of the outside of the throat that means she's swallowed. In any case, I keep her mouth open for a while, and watch to see any evidence of the tablet remaining in her mouth or under the tongue. Anyway, she's actually very good - as I'm about to feed her, she always jumps up on a cardboard box which puts her at about the height of my waist, and turns round to face the right way for the process to happen.
The Heimlich manoeuvre? Yes, I'm aware of that, as I've seen it demonstrated. But I'm not sure how well that would work with a small, fragile creature like a cat. Pardon the pun, but it could be catastrophic... Guess I'd give it a go if I really had to.
The Dreamies option with the hole-drilling and pussy putty sounds awfully fiddly - and anyway, crushing the tablets is not allowed. The advice of the vet was that they have to do down whole, as the tablets are designed to have a timed release of the contents, which won't work if the tablets are powdered or broken up.
Thanks for the answers!