Welcome to Pet Talk Baywatch Babe!!
I know chocolate id bad for dogs, as everyone else has said, and I DO NOT feed it to my girls, however, my parents dog is 13 years old and has eaten choc. chip and oreo cookies all her life. While you should stop feeding it to your dogs, don't worry too much about what she has already eaten.

Everyone else has made great suggestions for treats. Cheese, peanut butter and carrots are some of my girls favorites, along with Magic Liver cookies a treat made here, but the people at the dayschool the girls go to