Bangers every slip day or night any where anytime in the season the dogs runs a risk of getting injured some ground offers alot more risk but greater reward to both dog and handler hence you take a gamble if dogs gets banged up it's part and parcel of the job it happens bit like letting young pups run lose learning about obstacles and hazards not left on a lead till 18 months old you may get a knock or a tear it happens no one does it intentionally