If the bite has penetrated more than just the top layer of skin, ie gone into muscle or the wound is actually a tear then he needs Veterinary attention ASAP.
Meantime you need to flush the wound continuosly with cooled boiled water for at least 10 mins.
I would not put any creams or potions on it.
If in doubt a Vet check is always the best option.
A bite wound can easily abscessate which is always more of a problem to sort out.
Janex