iv run plough few times over the years,i wouldn't purposely walk plough fields all night lamping but if i put me head through a hedge and there's something worth running il slip the dog but as said only if its nice and soft and never had any problems.
i put this question up few year ago,some would say it depends on the type of dog you have and its style of running which may well make it more suitable and less injury prone than others,maybe