You need to contact your veterinarian immediately. They will be able to assess the situation and provide the necessary treatment, which may include:
* Cleaning and disinfecting the wound
* Antibiotics to prevent infection
* Rabies vaccination and/or post-exposure prophylaxis
Do not attempt to treat the bite yourself.
Here are some things you can do while waiting for the vet:
* Control bleeding: Apply gentle pressure to the wound with a clean cloth.
* Keep the wound clean: Rinse it thoroughly with warm water and mild soap.
* Keep your dog calm and restrained.
* Keep a close eye on the wound for signs of infection.
Remember, prompt veterinary care is crucial for your dog's health and safety.