Good friends of ours went on a family trip to the old country - Ireland. And we got stuck with their young rescue dog, who is a (you guessed it) pit-bull mix.
Aside from looking like a pit-bull, she's the most mellow and friendly girl. But here's the interesting part. They first brought the dog over our house about 6 months ago. And Tali (our 4 year old) growled at her. In subsequent visits, they would leave her in the car, and just let her out for a walk. But then they planned the Ireland trip, so we needed Tali to accept this dog. And so we did another get-together, specifically to get them acclimated. And when the time came for their trip, we began the dog's visit with a hike, which really helps them all to get along.
Now the dogs are fine with each other. But the crazy thing is that, within a few hours of her arriving, our male cat Nico not only doesn't hide, but has come out and toward the dog, and actually backed her up a few times.
We're all wondering what it is, which has a cat determine that the dog is totally fine, even fearful. It really took no time at all.