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Hello, this is Dr. Jess. I am sorry to hear about your puppy's problem! Are you sure that he didn't get bitten by the other dog (sometimes puppies end up humping whatever end is near them, including the head, which can result in another dog biting the penis if they are unhappy!). My only concern would really be if any bite are deeper wounds were present the possibility of an infection. Are you able to expose your dog's penis by retracting the prepuce (skin around the penis) to check for any wounds? This can be a tricky thing to do if you don't have experience in this. If you are able to fully expose the penis and see no wounds, I would just keep an eye on him. If you cannot expose the penis to check, or you are and see a wound, then I think it would be prudent to have your vet check it out and be sure we don't need an antibiotic!
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