Are old fashioned lilacs toxic to pets?

No, old-fashioned lilacs (Syringa vulgaris) are not considered toxic to pets. While ingestion of any plant material can cause mild gastrointestinal upset, lilacs generally do not pose a significant health risk to dogs or cats. However, it's always a good idea to monitor your pets and consult a veterinarian if you have concerns about their health or if they exhibit unusual symptoms after consuming any plant.