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Thank you for your question. My name is***** I have been a small animal veterinarian for 15years and I'd like to help with your question.
If it is a small nick (less than a quarter of an inch) and it is not bleeding you can use some liquid bandaid on it. You might have to run to the store to get it. First, just clean the area. Just with water is fine, but if you have some iodine or betadine you can add a little to the water to clean it. Pat it dry, try to get the edges of the skin close together and apply the liquid bandaid. Try to hold her still until it dries. If it won't hold then you might have to take her to a veterinarian and they will do the same, but with surgical glue which will stick better.
If it works then just watch it for redness or swelling that might indicate infection.
I hope that helps, but if you have more questions, please let me know. If all your questions are answered please rate this service.