Wintercreeper poses a significant health risk to both cats and dogs due to its toxicity. All parts of wintercreeper, including flowers, fruits, leaves, roots, seeds, stems, bark, and sap/juice, are poisonous. Immediate veterinary care is essential if a pet ingests wintercreeper, as symptoms may include vomiting, diarrhea, and abdominal pain. Prevent access to safeguard pet health.