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Bismihi ta'ala

If you mean on surface of body, yes, it needs to be purified, but if you mean inside body, like you swallowed dog's saliva, then nothing needs to be done.

And Allah knows best

What needs to be washed is the scalp

we should not do this. 

You as a Muslim are responsible to apply full Islamic Hijab and are legally entitled to practice you faith, so, do your best to explain your situation to your school and never compromise your duty to apply the Islamic Hijab.

'Wassalam.