Dog Alarms

I'm honestly not sure why this isn't a feature in Minecraft already, but it's never too late to add it in. Just like their real-life counterparts, Minecraft dogs should alert their owner to the presence of hostile people (mobs in this case). A dog's range of smell should be quite far, just like a real dog's. I understand this could make hostile mob encounter much less frequent, so in the act of balancing, when your dog alerts you to the presence of a hostile mob, that mob will also know you're nearby and will come after you.