I'm not sure I get why you're bent out of shape about dogs trained for war. Guard dogs and cats would probably be a castle upgrade if anything.
I just hate fighting bands of quick, small and suicidally brave mammals in games. No deeper reason, I just find those fights annoying. I won't die or rage quit if someone brings their dog to battle and animals with varying castle functions could be interesting.
What? No cat is mans best friends, dogs are just yay Sayers following you around like a cult leader, cats tell you when your outfit looks ugly or that you need to get your **** together, by that look they give, thats true friendship.Dog is a man's best friend. Hound as companion in village (or somewhere) would be nice.