The first thing you should do is contact your local veterinarian for advice. They may be able to provide treatments and medications to help the puppy.
In the meantime, you should clean the area around the maggots with a gentle antiseptic solution and keep the puppy as clean and dry as possible to prevent the spread of infection.
Be sure to wear gloves and use tweezers to carefully remove any visible maggots from the puppy’s fur. If you have any further questions or need additional help, please don’t hesitate to reach out.
Source: ViacomCBS Inc.
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