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No. Pity does not take an article. Also, generally we say I take pity on you or I have pity for you.
I pity you is OK. - I pity you, losing your dog like that.
Pity can be a verb or a noun
What does 'pity for you' mean?
Do not drown yourself in a pool of self-pity.
These days, self-pity is sometimes referred to as a "pity-party".
i pity you
pity, I think.
eg. I pity you for not having read any books in your childhood.