If those are actual cats, they’re too fat to attack even a dust-bunny.
There are a lot of animals that are aggressive and prone to attack humans, including a number of breeds of dogs. However, only a few kinds are big and strong enough to do serious damage or kill.
Most dog *bites* are from small dogs such as miniature poodles and little terrier breeds, but most injuries/deaths involve pit bulls and rottweilers. It doesn’t make them more “vicious” as a breed than others, but it does make them more dangerous, and pretending otherwise can be fatal.
I worry about the trend now to rescue every dog. Some are not suitable pets (not because of their breed but because of temperament, period). But it goes along with the ‘animals are the same as people’ idea the permeates our culture. My dog, btw, agrees with me.