My dog ate a chocolate pudding cup?

So I'm housesitting and I am taking a cake decorating class so I was making a cake that I filled with 2 chocolate pudding cups. I left the cake on the counter on a cake stand and when I came home an hour later 1/2 the cake was gone. I know chocolate is bad for dogs but should I be worried about her eating the chocolate pudding that was in the cake??? She's a big pitbull dog. They also have a little chihuahua but I don't think he ate any of the cake because I don't think it would have been possible for him to get on the counter. But the pitbull probably could have just stood on her hind legs and had a feast. Is there anything I should do for the dogs and are they going to be ok???