9mm lwc should suffice for a treed, 150 lb or less animal. I've heard that guys favor 22 mags for this job, because a lung hit will just make the cat 'hang" in the tree, until it falls out dead, thus saving the dogs a potentially damaging fight with the cat.
We use a predator call and call the animal in... Never used dogs before... I've seen to many pics of dogs that got the worst part of the deal from a large cat.
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