Cleon
Legend
Do we need the prices? The riding dog doesn't have them? But comparing to similar hounds in the CC, we should probably put training at 500 gp or so and pups at something also like 500 gp. Young aren't listed separately (isn't a "young dog" really a pup anyway?).
A riding dog doesn't have them in the Monster Manual, but it has a price listed in the Player's Handbook (150 gp), which includes training in Combat Riding.
That should give us some idea as to how much a war dog should cost.
In this cast a "young dog" is a fullgrown (or mostly so) but untrained youth. I'm trying to come up with a better name for it...