In a world were we can turn horses into dragons it is important that we can also armour our trusty hounds.
Or, from a roleplaying mechanics point of view; does your system cope with non-humanoid armour?
Game systems with abstract armour rules tend to cope better than those which require hit locations and tables. Sure enough; a table can be written for a canine quadruped but is that enough?
If we assume that game systems with hit locations, rather than abstraction, are more interested in creating realistic rules then surely we’d have to consider that an attack dog, in a fight, will be more likely to recieve hits to its front and face than a canine simply on guard duty. The latter, if sniped by an arrow, is far more likely to be hit on the flank.
The armour shown here is Samurai style armour. Eff Yeah Asian History speculate that it was created for a rich Samurai and as much for status as for armour.
General opinion is that this set was made from a dog belonging to a very senior samurai, possibly a daimyo, who apparently was extremely found of this canine companion […] This set is of dubious practical value, and was almost certainly produced as a novelty item to appease the whim of an apparently very wealthy, powerful, and one can only assume, somewhat eccentric samurai warrior. The armour was most like used likely limited in its use to being worn during […] formal parade-like situations.