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Hi. My name is***** I'm sorry to hear about Tank's injury. Where is the wound at? Can you post a picture of it? At this time, the use of hydrogen peroxide on cleaning that wound won't be a bad thing. Hydrogen peroxide is used by some to get cats to vomit, but I don't recommend this at all as it can be more irritating to the stomach. The use of a small amount on a wound shouldn't be a bad thing by any means. More importantly is taking care of the actual wound itself. I know you said you're new to the area and haven't gotten a vet yet. I would encourage calling the clinics in the area to see if one can see him today. The sooner a wound is addressed by a veterinarian, most of the time the better. If this wound is fresh, it needs to be seen in about 8 hours to allow it to be sutured shut. After that time, it may not be good to close due to drying out.