First of all, I am NOT an expert on this, but I did some research. I can't find anything about the herb rosemary being toxic in any way.
However, I DID find out that a plant called "rosemary pea" is toxic. Here's my source.
Plants Toxic to Dogs
So, I don't think you need to worry about it. If you still have questions about the food, contact the company. It wouldn't hurt to ask your vet as well.
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RIP Gizmo 3/9/07-8/18/12)