Oh, Mickey, have you been talking to Kito?? He has that nasty habit too--not so much any more, but eeeeeeewwwwwwwwwww!!!!!
The gross thing about Kito though, is that he would try to eat other poop, because no one picked it up at our old apartment
Since I always had him on the leash, I always told him no, and pulled him away.
I have read up on it (it's called cophragia, I think), and it is harmful to eat poop, they could get worms or anything else that another dog may have.
Since it is his own, I'm not sure how harmful it is, just gross.
I know there are some other things you can add to their food to make it taste bad, one being meat tenderizer, and there are also supplements they sell that you can add to their food.
I've also read that you can put something like tabasco sauce on it, and when he goes to eat it it will taste bad.
Here's a link to a website that may help
http://bullmastiffinfo.tripod.com/coprophagia.htm