nah iv done it heaps and most of the blokes i'v hunted with do it aswell, although all those dogs were bialing dogs not a whole lot of balls, each would still do the job, but they wouldnt give each other a hard to time no dogs ever got puinshed by the fox and no dramas ever occured, if things started to get ruff we'd just call your dogs out by name, the dogs i work with now but are abit harder and so its not what i like to do, although i will put a young pup behind my dog and so does everyone i know including the hunt clubs, aslong as your dogs are well socialised and have half a brian in ther