You can always check to see if the plant is poisonious or not on the ASPCA's website, they have a list of toxic things to dogs and if you are still concerned you can call the animal poison control phone number and speak with a vet on duty (know this from experience with my Fajita vegtable eating Puggle 😞 )
I am so glad to see I am not the only one dealing with this issue. We got Bella when she was four months old and the chase has been on ever since. She turned one year old on December 27th and I am still dealing with this. Eight months of cat chasing and I think I am going looney here. :eek: