This didn't happen during classic afaik. Pets always broke mezzes, differentiating good and bad pet controllers, and even scarier for enchanters if they chose to use a pet. This was changed in a patch
June 5th, 2002
Quote:
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Pets will not attack mesmerized creatures. Pets basically treat mesmerized NPCs as if they were dead.
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http://www.tski.co.jp/baldio/patch/20020605a.html