PACCC Certified Professional Animal Care Provider (CPACP) Practice Test

Hydrogen peroxide is not recommended for cleaning a fresh wound because it can damage healthy tissue. When applied, it releases reactive oxygen species that are cytotoxic to the cells essential for healing, like fibroblasts and keratinocytes. This can slow the healing process and even delay wound closure, especially in a new, uncontaminated wound. In contrast, washing with warm water or sterile saline is gentle and effective at physically clearing debris without harming healing tissue. After cleaning, applying a thin layer of antibiotic ointment (if indicated) helps prevent infection and keeps the area moist, which supports healing. Covering the wound with sterile gauze protects it from further contamination and provides a stable environment for repair. So the best practice for cleaning a fresh wound is to use mild irrigation with water or saline, avoid hydrogen peroxide, and then proceed with appropriate dressing and topical care as needed.