Not being on hand to supervise at least their initial meeting is a bad idea. Yes, they'll work it out for themselves, but you want to be there to stop anything that gets out of hand.
I once watched a greyhound--a very sweet, docile guy--crush the head of a chihuahua it was training next to. From zero conflict to dead dog was about two seconds. Literally, a dog gets taken over by its instinct to chase and hunt, and no amount of training or temperament can stop it ending in violence. Even if you ARE there, you'd be lucky to stop anything bad from happening, but you want to give your cat the best shot you can, right?
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