Sentence-final 「ど～」?

Question

I came across this image online.

What does the ど～ in はしったど～ mean?

Answer 1

While influence from television (from comedians on TV like 濱口 優) have popularized ど〜　into the general public and have made it to be used more jokingly. ど~ actually is a form of 方言 (seen in some 関西 dialects and other places), as seen in 播州弁 and 紀州弁 were ぞ and ど have become mixed.

Answer 2

「～したど」 is a kidding way of saying 「～したぞ」.