Some dogs, yes. If a cat can be naturally evil (well, that might have been the abuse at a tiny age, who knows) so can a dog.
It’s rare, but there. More common are unstable untrustworthy dogs. Some are just incorrigible. And much more dangerous than a cat, at decent sizes.
Evil implies sin and a conscious choice to commit sin, knowing the difference between good and evil.
Animals cannot sin.
They suffer the effects of a fallen world but they do not and can not sin, nor can they be “evil”.
Evil is a choice reserved solely for humans.
[although a cat joyously, slowly and meticulously dismembering some small animal could be said to offer a fair imitation of ‘evil’]