My donkey is not young but not old~ She acts like she is backing up to him but I can't really tell :9Is the donkey still young? Usually young males try to breed, but are actually "practicing" on the mares that will let him, even though they may not be in heat. Some mares will tolerate this, others won't. By the time my colts reach one year old , I have to separate them , as they drive the mares bananas! Maybe your stud "knows" she isn't in heat right now. Is she backing up to him and showing any other signs of heat?