Why did my cat foam at the mouth when I gave her a pill?

Dear Most Esteemed and Knowledgeable Kitties: We are giving our cat new medication for an infection. She foamed at the mouth when we did it. What makes a cat do this and should we be concerned? ~Sue Siouxsie: Well, Sue, typically a cat will foam at the mouth when given a pill because most pills are extremely bitter. The foaming at the mouth is one way we protect ourselves from caustic substances.

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