How do you stop a dog from peeing on the porch?

My dog is a Cattle dog mix and keeps peeing on the backyard porch.I don't really know what to do and my parents want me to find her another home.At first I thought it was an insecurity problem, that she felt the need to mark on the territory that was closer to her house. But now it's out of control and I don't know how to stop her.It's not an outdoor dog. There's a doggy door and they can go in and out whenever they please.

I assume the dog lives in the back yard. The porch means nothing to the dog. it's just outside. Can you use a gate of some kind to make the porch off limits?

Squirt him with a hose(:

Put him in the grass constantly until he realises he's not supposed to do it anymore

i had a pit mix that did the same thing but after i washed it with bleach i put a puppy pad down that he had peed on and slowly moved it of my porch and into the yard. after that i washed the deck again with bleach and the problem was solved. not sure if it works for all dogs but it did for mine

It certainly sounds like she's marking her territory. You'll probably have to take the same steps necessary in housebreaking a dog. Reward her when she goes in the yard and correct her (pull up on her collar and say in a firm voice "no") and take her to the grass when she tries going on the porch (you'll have to catch her in the act though). It's sort of a myth that female dogs don't mark territory; they're just less likely to do it. I would do as the above poster said and wash the porch with bleach. There is probably a stray cat, racoon, etc. that she's competing with so it can't hurt to give it a shot. They also make something called Urine-Off (or something like that) that helps get rid of animal urine scent to deter spraying (probably kind of pricey though).