Could be!
I saw a couple of altercations and it ended when the cat sliced up the dog's nose. Short battles.
Of course, if the dog persists the only chances for the cat are to flee or roll onto it's back, grab the dog with front paws, and disembowel the dog with it's hind legs. It never came to that, at least in my observation.
My pitador had a confrontation with a kitty I had at the time when he was still a puppy. He’d been bothering her for a while. Then I came home one day and discovered him with a gash in his nose about half an inch long and an eighth of an inch deep. He got no sympathy. I just told him he’d had a lesson in kitty manners. It was really funny afterwards, watching him try to whack her with his paw while keeping his nose out of range.