I've heard about chocolate too, and since Cookie goes after her mom, the addiction to it is there as well So, we got her some dog chocolates that are harmless and are a good treat for learning to come when I call her out of the garden.
What I did for her 6 months birthday, was baking some Cookie Muffins with carrob. She and the party guests loved it.

There is also something about onions, or am I wrong here?