An excellent hint for dog and cat owners having to force feed medicine to an unwilling patient. After you have medicated your pet and held the jaw closed with the hope the animal will swallow it, partially release the animal's muzzle.

If he licks his lips, never fear, the medicine is swallowed and you can let go. If he doesn't lick his lips immediately, hold his muzzle closed again. The little "so and so" is just biding his time to spit or foam the medicine out.

Dogs and cats reflexively lick their lips after swallowing medication - I learned this from an old country vet.