Why so disgusting?

Dixie, the disgusting shit-eater, has turned Cody into some kind of horrible soft-serve machine. She follows Cody around with her nose literally up Cody's butt, and when Cody squats to do her business Dixie is right there ready to catch - and does.

We've tried seasoning salt on their food, and meat tenderizer, but neither has helped. It might even be making Cody's poop more appetizing. And Dixie only eats Cody's poop, not her own. She'll turn around and sniff her own poop, but won't eat it.

Any suggestions?