I am dealing with the same problem now so I feel your pain. Flower is 7 month-old and started eating her own poop about 2 weeks ago. I ordered Forbid from Foster & Smith,
www.drsfostersmith.com. I think it's working but she picked up her poop and brought it to her bed yesterday. She bit on it and sniffed but didn't eat it. I'll continue using Forbid and hopefully it will eliminate the problem completely.