wolf training system

I often find it irritating that I need to punch a mob to have my wolf attack it i feel that wolves should have a feature that allows you to train them to hunt and kill specific mobs. i believe this can be done by way of unique mob drops such as rotten flesh mob heads and items unique to various mobs. for instance, say I'm holding a zombie head while standing near my wolf and a button pops up in the bottom of my screen that says (track, sniff, detect) whatever works. i then push the button causing the wolf to do a brief sniffing animation and start attacking the nearest zombie or zombified mob. i believe this feature might have its draw backs because not all mobs drop their own unique item, and some don't drop items at all. to this i would say that if a mob does not drop something there's no use in killing it. another drawback that might occur is that the wolf is more likely to die if the hostile mob is not already tracking the player to this i have very little to say. Maby wolf armor might be a good idea to make them less pathetic.