Nettiquette in title and description

Maybe this sounds funny, but as i'm not English or US citizen and also not absolute perfect in english language i would like to know if i can write in a title and in the description that a horse is pissing?
Or how can i describe it?

The polite way of describing it would be to say something like "White horse urinates while being ridden by...."

White horse is urinating.
White horse urinated.

Paul.

Thanks Paul, that's great!

Add piss and pee as well