We have two cats at our house and we recently got a dog. I think she's around 10 months old now. The thing is, this dog keeps barking at our cats and one of them always runs away in fear of the dog. However, this other cat would always just stare at the dog and if it ever comes close, it would hiss and attempt to claw at the dog's face. That's the time that the dog will back off. What a brave cat! However, we are still trying to keep them apart, just to make sure they will not hurt each other.