I was always told that if i saw a dog chasing to shoot them.
That is legal in some states.
Now, I do have rabbit dogs. But we must use commen sense and don't hunt rabbits until deer season is over, unless we know the land and the owners VERY well. We hunt our land during deer season, but no land we are invited on until after deer season. Some pups will run deer even after being trained as a rabbit dog. Deer scent is more dominant.