Well to the remark about if the dogs were properly trained and had one person controlling them, well I dont really know if that would work all that well unless used for a quick get in get out type job like as mentioned like, maybe against cavlery or maybe snouting for scouts or people trying to get close to the peticular army. But at the same time I can kinda see a couple of downfalls to using dogs, I may be wrong on a couple of things or straying but hear me out...
here are just a few I thought of:
1. to get to the idea of horses and the use of the dogs, it all depends on the breed that they were using and how well they were trained, the horses were probably used to things like dogs and things attacking them whilst they kept their load(the guys) on as best the could and the noise of battle(some how I dont think you could hear the dogs to well, barking wise i mean). where would the dogs attack(or go for) and what would pe the possibility of them getting stomped or kicked or even trampled.
2.with the one person controlling them:
(1.) how would they control them,
(2.)what happens if the person in question croaks because of what ever means that got them, would the dog be trianed on how to deal with that?
I know the last one has some speculations in it but, you know you have to think what the big points(and some minor)are and how they affect everything.
thanks for hearing me out
And as a last and final thought- obvoisly the dogs weren't to succsessfull becuase they have bein menchioned a coupel of times in history that I am aware of.(sorry for the bad spelling I have bein up for 32 hrs and counting
sighning out
brotus