Is this abuse or discipline?

i have a small pitbull puppy he was recently in my bed and was biting me so i said calmly 3 times to stop biting he continued so i held his mouth shut and said with a more louder and serious tone to stop and he did around a minute or two later he grabbed my finger and one of his teeth hooked under my nail and in the pain i gave him a light shove that rolled him but he got back up and came back and licked me but then i felt bad for it would you classify this as abuse or disciple cause i have a brother who beats his dog and i don’t wanna be like that like i spank my older dog he is 6 months but i don’t do it hard enough to leave marks or make him yelp he will run off and lay in his bed then look sad but after about a minute he is fine again i have only had to do it once or twice though mostly i will always use a calm stop or bad and it fixes it what do y’all think

Is this abuse or discipline?
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