Hello! I'm sorry to hear that finding a list of pet-friendly native plants and flowers has been challenging. Unfortunately, I do not have a list that specifically details native plants that are pet-friendly.  Perhaps the best route to take in this situation is to choose the plants you would like to have in your garden and then research the characteristics of the individual plants. If they are poisonous, it should be listed in the desccription .

There are many resources listing native plants in the Midwest.  No doubt you have visited some othe them.  I have listed a good resource below, if you would like to pursue an additional one.

 https://www.canr.msu.edu/nativeplants/plant_facts/local_info/index

I hope you have some success in finding the plants you need.