6 Answers

Do you know the owner of the dog? You should report the owner to the police.

clean your skin, with dettol, then follow with a good dose of betadine.

make sure the betadine is dry, then maybe wrap it with bandage if needed.

Go for an injection soonest against Rabi's

  depending where you live you should get it checked out for a rabies shot if you live in the UK you wont need a Rabi s shot but you must clean any kind of bite from any animal as soon as possible first clean water then a anticeptic Dettle or TCP and if you dont have any to hand use salt diluted in water if the bite starts to look angry (red and inflamed or swelling ) get to a Doctor or Hospital soon all so if you see a red line traverling up your arm from your wrist see a Doctor Urgent this is  a form of Blood poison

tcp.has a dog actually bitten you?just reread your question and noticed the word "if"

go to the hospital.