Are the girls still hungry? If you don't think they are, perhaps distract them with a small tiny but favorite treat once they all finish eating. But only after eating and as soon as you see them heading for poor Fonzi.
If the treat doesn't work... to keep them from Fonzi. Then I am at a loss what to suggest.
Hopefully Plum will have the answer.
Love All Life, Thank You For Posting! :)