Is silly string poisonous to dogs?

Yes, silly string can be poisonous to dogs if they ingest it. The main component of silly string is polyvinyl acetate, which is a synthetic polymer that is not digestible by dogs. If a dog ingests silly string, it can cause gastrointestinal problems such as vomiting, diarrhea, and abdominal pain. In some cases, silly string can also cause respiratory problems if it is inhaled. If you think your dog has ingested silly string, it is important to contact your veterinarian immediately.