the truth is, its all part and parcel of running dogs, i suspect it was just coursing thirst in your case, but being able to recognise the symptoms is something everyone should familiarise themselves with, the other conditions are just further down the same road as coursing thirst, reasons, well you could go mad trying to find one, the best you can do is keep the dogs as fit as possible the rest is down to luck and nature neither of which we have any control over.
spot on paulus....the other part is I think is for the owner to know there dog ,thats why I like my dogs to be around the fami