I think it wrong to classify wardogs as a fanatsy unit. There is no doubt that dogs were used in ancient warfare in fact its where we get the phrase 'Cry havoc and let slip the dogs of war'.

However, I think they were a very specialised unit nad certainly not a major feature of any battle. The historical articles I have read state that their most common usage was against cavalry where they were equipped with vertical blades strapped to their back and trained to run under and between the horses legs thus causing confusion and havoc amongst mounted formations.

The biggest problem however must have been enemy recognition and I suspect that once released wardogs ought to count as 'running amok' after their initial unit contact.