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Hey Kimberly! It sounds likeHey Kimberly! It sounds like your dog's healing wound is abcessing and infection is trapped inside the healed over wound. You *might* try to lance it, but unless you know what you are doing you might just ended up getting bitten. If it does not go down in a day or two I would take my dog to the vet as worst case scenario the abcess goes septic/blood poisoning and you could lose your dog.

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