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Hello, this is Dr. Jess. I am sorry to hear about your dog! Can you tell me how large the wound is? Is it very deep? Groundhogs can have very large teeth that could penetrate deeply depending on the bite, so oral antibiotic therapy may be warranted which would require a visit to your vet, if the wound is deep.
Will your dog allow you to examine and clean it well yet? I would recommend cleaning it thoroughly- if it is a deep wound, then flushing it out if you have a syringe you can fill with fluid will help dislodge any material that could be deep inside the wound (if your dog won't let you do this, then this is another reason to visit the vet). A triple antibiotic ointment, such as neosporin, can then be applied to the area. If it is very superficial this may be adequate, but if it is deeper then this may not be enough.